JIT: Convert multi-target switches to branchless checks by JulieLeeMSFT · Pull Request #124567 · dotnet/runtime

JulieLeeMSFT · 2026-02-18T19:25:47Z

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

JulieLeeMSFT · 2026-02-18T19:25:47Z

Fixes#123858.

This PR improves JIT codegen for multi-target switch-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with or (e.g., x is A or B or C).

When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In fgOptimizeSwitchBranches).
When both targets are simple return blocks, fgFoldCondToReturnBlock further folds this into branchless return.

Example

privatestaticboolIsLetterCategory(UnicodeCategoryuc){returnuc==UnicodeCategory.UppercaseLetter||uc==UnicodeCategory.LowercaseLetter||uc==UnicodeCategory.TitlecaseLetter||uc==UnicodeCategory.ModifierLetter||uc==UnicodeCategory.OtherLetter;}

Before

cmpecx,4ja SHORT G_M22758_IG05moveax,1retG_M22758_IG05:xoreax,eaxret

After

cmpecx,4setbe almovzxrax,alret

Details

The comparison direction is chosen to GT_LT.
Edge dup counts are fixed up after conversion.
Added tests for zero-based and non-zero-based consecutive ranges.

ASMDiffs

SPMI asmdiffs show code size improvements of 83 bytes.

dotnet-policy-service · 2026-02-18T19:26:40Z

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

JulieLeeMSFT · 2026-02-18T19:27:23Z

@EgorBo, PTAL.
CC @dotnet/jit-contrib.

Copilot

Pull request overview

This PR optimizes multi-target switches where all non-default cases target a single block (distinct from the default target) by converting them into unsigned range comparisons. This enables branchless code generation when both targets are simple return blocks, addressing the disparity between pattern matching and explicit equality comparisons noted in issue #123858.

Changes:

Adds logic in fgOptimizeSwitchBranches to detect and optimize switches with exactly 2 unique successors
Transforms such switches into unsigned LE/GT comparisons, choosing the direction to favor fall-through
Adds comprehensive test coverage for both zero-based and non-zero-based consecutive ranges

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/coreclr/jit/fgopt.cpp	Implements the switch-to-range-check optimization with edge weight/dup count fixup and profile weight updates
src/tests/JIT/opt/OptSwitchRecognition/optSwitchRecognition.cs	Adds tests for zero-based (0-4) and non-zero-based (10-14) consecutive value ranges with comprehensive boundary cases

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

…etbe).

JulieLeeMSFT · 2026-02-20T23:32:24Z

@EgorBo, I addressed all comments. It's ready to review.

EgorBo

LGTM with a few suggestions

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

JulieLeeMSFT · 2026-02-24T17:44:43Z

/ba-g Failures are timeouts in Android pipeline. Not related to this PR.

Fixesdotnet#123858. This PR improves JIT codegen for multi-target `switch`-style tests by converting eligible cases into branchless checks. The goal is to produce optimal codegen that matches the intent of C# pattern matching with `or` (e.g., `x is A or B or C`). When a switch has exactly 2 unique successors (all non-default cases target one block, default targets another), convert it from Switch to an unsigned range comparison (In `fgOptimizeSwitchBranches`). When both targets are simple return blocks, `fgFoldCondToReturnBlock` further folds this into branchless return. ## Example ```csharp private static bool IsLetterCategory(UnicodeCategory uc) { return uc == UnicodeCategory.UppercaseLetter || uc == UnicodeCategory.LowercaseLetter || uc == UnicodeCategory.TitlecaseLetter || uc == UnicodeCategory.ModifierLetter || uc == UnicodeCategory.OtherLetter; } ``` ## Before ```asm cmp ecx, 4 ja SHORT G_M22758_IG05 mov eax, 1 ret G_M22758_IG05: xor eax, eax ret ``` ## After ```asm cmp ecx, 4 setbe al movzx rax, al ret ``` ## Details - The comparison direction is chosen to GT_LT. - Edge dup counts are fixed up after conversion. - Added tests for zero-based and non-zero-based consecutive ranges. ## ASMDiffs - SPMI asmdiffs show code size improvements of 83 bytes. --------- Co-authored-by: Egor Bogatov <egorbo@gmail.com>

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JIT: Address PR review comments for Switch pattern opt.
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JIT: Address PR review comments for Switch pattern opt.
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Test failure: baseservices/exceptions/stackoverflow/stackoverflowtester/stackoverflowtester.cmd #110173
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