build: fix const correctness in ggml-bitnet-mad

[Darshan (darsh7807)]

Summary

Fix a clang compiler error in src/ggml-bitnet-mad.cpp caused by dropping const qualification from a pointer derived from const int8_t * y.

Root cause

y is declared as const int8_t *, so y + col * by is also const int8_t *. The code assigned that expression to int8_t * y_col, which discards const qualification and fails to compile on clang.

Change

• Change int8_t * y_col to const int8_t * y_col

Verification

• Ran a targeted syntax check with Apple clang on macOS arm64:

clang++ -std=c++17 -fsyntax-only -Iinclude -I./src -I./3rdparty/llama.cpp -I./3rdparty/llama.cpp/include -I./3rdparty/llama.cpp/ggml/include -I./3rdparty/llama.cpp/ggml/src src/ggml-bitnet-mad.cpp

• Full CMake configure in the repo is currently blocked by the separate open issue #378 (include/bitnet-lut-kernels.h missing), so validation here was limited to the affected translation unit.

Closes#407

[Darshan (darsh7807)]

Verified locally on macOS arm64 by forcing syntax checking of the AVX2 branch.

On clean main:

clang++ -target x86_64-apple-darwin -D__AVX2__ -std=c++17 -fsyntax-only -Iinclude -I./src -I./3rdparty/llama.cpp -I./3rdparty/llama.cpp/include -I./3rdparty/llama.cpp/ggml/include -I./3rdparty/llama.cpp/ggml/src src/ggml-bitnet-mad.cpp

This reproduces:

src/ggml-bitnet-mad.cpp:811:18: error: cannot initialize a variable of type 'int8_t *' with an rvalue of type 'const int8_t *'

On this branch, the same command succeeds after changing y_col to const int8_t *.

[Hannah Baldwin (habaldwin01)]

Confirming that this PR also fixes failing compilation on Debian 12 (AMD64).

On a clean main branch, using the command python setup_env.py -md models/BitNet-b1.58-2B-4T -q i2_s I get the following error:

/app/BitNet/src/ggml-bitnet-mad.cpp:811:18: error: cannot initialize a variable of type 'int8_t *' (aka 'signed char *') with an rvalue of type 'const int8_t *' (aka 'const signed char *')
int8_t * y_col = y + col * by;
^ ~~~~~~~~~~~~

Applying the patch fixes this and the package compiles successfully. I would greatly appreciate this being merged!

[Matthew Zipkin (pinheadmz)]

Same issue here, this patch got me past the error -- thanks!

/home/pinheadmz/Desktop/work/BitNet/src/ggml-bitnet-mad.cpp:811:18: error: cannot initialize a variable of type 'int8_t *' (aka 'signed char *') with an rvalue of type 'const int8_t *' (aka 'const signed char *')
811 | int8_t * y_col = y + col * by;
| ^ ~~~~~~~~~~~~

Ubuntu 24 / x86_64 / clang-20

[Mike (alveusdev)]

Same issue. Can confirm patch resolves the compilation error

Ubuntu 24.04.4 LTS
Ubuntu clang version 18.1.3 (1ubuntu1)

[Darshan (darsh7807)]

How do I contact maintainers to merge this PR?

[Leonardo Amaral (leleobhz)]

Same issue. Can confirm patch resolves the compilation error

Ubuntu 24.04.4 LTS
Ubuntu clang version 18.1.3 (1ubuntu1)

Same here:

[1/2] STEP 11/13: RUN python setup_env.py -md models/BitNet-b1.58-2B-4T -q i2_s || (cat logs/compile.log && cat /etc/*release && clang --version && exit 1)
INFO:root:Compiling the code using CMake.
ERROR:root:Error occurred while running command: Command '['cmake', '--build', 'build', '--config', 'Release']' returned non-zero exit status 2., check details in logs/compile.log
[ 1%] Building C object 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/ggml.c.o
In file included from /tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:7:
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml-quants.h:156:7: warning: no newline at end of file [-Wnewline-eof]
156 | #endif
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1177:37: warning: cast from 'void (*)(const uint8_t *, float *, int64_t, const float)' (aka 'void (*)(const unsigned char *, float *, long, const float)') to 'ggml_to_float_t' (aka 'void (*)(const void *restrict, float *restrict, long)') converts to incompatible function type [-Wcast-function-type-mismatch]
1177 | .to_float = (ggml_to_float_t) dequantize_row_i2_s,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1184:37: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
1184 | .nrows = 1,
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1181:37: note: previous initialization is here
1181 | .nrows = 1,
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:2318:5: warning: implicit conversion increases floating-point precision: 'float' to 'ggml_float' (aka 'double') [-Wdouble-promotion]
2318 | GGML_F16_VEC_REDUCE(sumf, sum);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1423:37: note: expanded from macro 'GGML_F16_VEC_REDUCE'
1423 | #define GGML_F16_VEC_REDUCE GGML_F32Cx16_REDUCE
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1412:11: note: expanded from macro 'GGML_F32Cx16_REDUCE'
1412 | res = _mm512_reduce_add_ps(x[0]); \
| ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:2366:9: warning: implicit conversion increases floating-point precision: 'float' to 'ggml_float' (aka 'double') [-Wdouble-promotion]
2366 | GGML_F16_VEC_REDUCE(sumf[k], sum[k]);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1423:37: note: expanded from macro 'GGML_F16_VEC_REDUCE'
1423 | #define GGML_F16_VEC_REDUCE GGML_F32Cx16_REDUCE
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:1412:11: note: expanded from macro 'GGML_F32Cx16_REDUCE'
1412 | res = _mm512_reduce_add_ps(x[0]); \
| ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12543:6: warning: no previous prototype for function 'float_act_quant' [-Wmissing-prototypes]
12543 | void float_act_quant(const int K, float* B, int32_t* dst, float* act_scale) {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12543:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
12543 | void float_act_quant(const int K, float* B, int32_t* dst, float* act_scale) {
| ^
| static
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12563:18: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12563 | if (fabs(A[i]) > max){
| ~~~~ ^~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12564:32: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12564 | i2_scale[0] = fabs(A[i]);
| ~~~~ ^~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12574:37: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12574 | dst[i] = (double)A[i] * i2_scale[0] > 0 ? 1 : -1;
| ~ ^~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12559:6: warning: no previous prototype for function 'weight_quant_f32' [-Wmissing-prototypes]
12559 | void weight_quant_f32(const int M, const int K, float* A, int32_t* dst, float* i2_scale) {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12559:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
12559 | void weight_quant_f32(const int M, const int K, float* A, int32_t* dst, float* i2_scale) {
| ^
| static
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12583:18: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12583 | if (fabs(temp_A) > max){
| ~~~~ ^~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12584:32: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12584 | i2_scale[0] = fabs(temp_A);
| ~~~~ ^~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12595:39: warning: implicit conversion increases floating-point precision: 'float' to 'double' [-Wdouble-promotion]
12595 | dst[i] = (double)temp_A * i2_scale[0] > 0 ? 1 : -1;
| ~ ^~~~~~~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12579:6: warning: no previous prototype for function 'weight_quant_f16' [-Wmissing-prototypes]
12579 | void weight_quant_f16(const int M, const int K, uint16_t* A, int32_t* dst, float* i2_scale) {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12579:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
12579 | void weight_quant_f16(const int M, const int K, uint16_t* A, int32_t* dst, float* i2_scale) {
| ^
| static
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12600:6: warning: no previous prototype for function 'matrixMultiply_int' [-Wmissing-prototypes]
12600 | void matrixMultiply_int(const int M, const int N, const int K, const int32_t* A, const int32_t* B, int32_t* C) {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:12600:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
12600 | void matrixMultiply_int(const int M, const int N, const int K, const int32_t* A, const int32_t* B, int32_t* C) {
| ^
| static
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:14084:26: warning: unused variable 'type' [-Wunused-variable]
14084 | const enum ggml_type type = src0->type;
| ^~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:14291:48: warning: passing 'const struct ggml_compute_params *' to parameter of type 'struct ggml_compute_params *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
14291 | ggml_compute_forward_get_rows_i2_s(params, dst);
| ^~~~~~
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml.c:14073:42: note: passing argument to parameter 'params' here
14073 | struct ggml_compute_params * params,
| ^
17 warnings generated.
[ 1%] Building C object 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/ggml-alloc.c.o
[ 2%] Building CXX object 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/ggml-backend.cpp.o
[ 3%] Building C object 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/ggml-quants.c.o
In file included from /tmp/src/3rdparty/llama.cpp/ggml/src/ggml-quants.c:4:
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml-quants.h:156:7: warning: no newline at end of file [-Wnewline-eof]
156 | #endif
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/ggml-quants.c:16179:2: warning: no newline at end of file [-Wnewline-eof]
16179 | }
| ^
2 warnings generated.
[ 4%] Building CXX object 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/__/__/__/__/src/ggml-bitnet-mad.cpp.o
In file included from /tmp/src/src/ggml-bitnet-mad.cpp:5:
In file included from /tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-quants.h:4:
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:154:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
154 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:154:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:175:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
175 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:175:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:196:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
196 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:196:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:261:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
261 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:261:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:294:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
294 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:294:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:311:9: warning: anonymous structs are a GNU extension [-Wgnu-anonymous-struct]
311 | struct {
| ^
/tmp/src/3rdparty/llama.cpp/ggml/src/./ggml-common.h:311:9: warning: anonymous types declared in an anonymous union are an extension [-Wnested-anon-types]
/tmp/src/src/ggml-bitnet-mad.cpp:51:100: warning: unused parameter 'quant_weights' [-Wunused-parameter]
51 | size_t quantize_i2_s(const float * src, void * dst, int64_t nrow, int64_t n_per_row, const float * quant_weights) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:200:39: warning: cast from 'const void *' to 'unsigned char *' drops const qualifier [-Wcast-qual]
200 | const uint8_t * x = (uint8_t *)vx;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:201:38: warning: cast from 'const void *' to 'signed char *' drops const qualifier [-Wcast-qual]
201 | const int8_t * y = (int8_t *)vy;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:198:56: warning: unused parameter 'bs' [-Wunused-parameter]
198 | void ggml_vec_dot_i2_i8_s_1x1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:198:112: warning: unused parameter 'by' [-Wunused-parameter]
198 | void ggml_vec_dot_i2_i8_s_1x1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:198:6: warning: no previous prototype for function 'ggml_vec_dot_i2_i8_s_1x1' [-Wmissing-prototypes]
198 | void ggml_vec_dot_i2_i8_s_1x1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:198:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
198 | void ggml_vec_dot_i2_i8_s_1x1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
| static
/tmp/src/src/ggml-bitnet-mad.cpp:416:39: warning: cast from 'const void *' to 'unsigned char *' drops const qualifier [-Wcast-qual]
416 | const uint8_t * x = (uint8_t *)vx;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:417:38: warning: cast from 'const void *' to 'signed char *' drops const qualifier [-Wcast-qual]
417 | const int8_t * y = (int8_t *)vy;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:414:60: warning: unused parameter 'bs' [-Wunused-parameter]
414 | void ggml_vec_dot_i2_i8_s_1x4_32W(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:414:116: warning: unused parameter 'by' [-Wunused-parameter]
414 | void ggml_vec_dot_i2_i8_s_1x4_32W(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:414:6: warning: no previous prototype for function 'ggml_vec_dot_i2_i8_s_1x4_32W' [-Wmissing-prototypes]
414 | void ggml_vec_dot_i2_i8_s_1x4_32W(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:414:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
414 | void ggml_vec_dot_i2_i8_s_1x4_32W(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
| static
/tmp/src/src/ggml-bitnet-mad.cpp:514:39: warning: cast from 'const void *' to 'unsigned char *' drops const qualifier [-Wcast-qual]
514 | const uint8_t * x = (uint8_t *)vx;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:515:38: warning: cast from 'const void *' to 'signed char *' drops const qualifier [-Wcast-qual]
515 | const int8_t * y = (int8_t *)vy;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:512:56: warning: unused parameter 'bs' [-Wunused-parameter]
512 | void ggml_vec_dot_i2_i8_s_1xN(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:512:112: warning: unused parameter 'by' [-Wunused-parameter]
512 | void ggml_vec_dot_i2_i8_s_1xN(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:512:6: warning: no previous prototype for function 'ggml_vec_dot_i2_i8_s_1xN' [-Wmissing-prototypes]
512 | void ggml_vec_dot_i2_i8_s_1xN(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:512:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
512 | void ggml_vec_dot_i2_i8_s_1xN(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
| static
/tmp/src/src/ggml-bitnet-mad.cpp:793:39: warning: cast from 'const void *' to 'unsigned char *' drops const qualifier [-Wcast-qual]
793 | const uint8_t * x = (uint8_t *)vx;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:794:38: warning: cast from 'const void *' to 'signed char *' drops const qualifier [-Wcast-qual]
794 | const int8_t * y = (int8_t *)vy;
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:811:18: error: cannot initialize a variable of type 'int8_t *' (aka 'signed char *') with an rvalue of type 'const int8_t *' (aka 'const signed char *')
811 | int8_t * y_col = y + col * by;
| ^ ~~~~~~~~~~~~
/tmp/src/src/ggml-bitnet-mad.cpp:791:84: warning: unused parameter 'bx' [-Wunused-parameter]
791 | void ggml_vec_dot_i2_i8_s_Nx1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:791:6: warning: no previous prototype for function 'ggml_vec_dot_i2_i8_s_Nx1' [-Wmissing-prototypes]
791 | void ggml_vec_dot_i2_i8_s_Nx1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
/tmp/src/src/ggml-bitnet-mad.cpp:791:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
791 | void ggml_vec_dot_i2_i8_s_Nx1(int n, float * s, size_t bs, const void * vx, size_t bx, const void * vy, size_t by, int nrc) {
| ^
| static
32 warnings and 1 error generated.
gmake[2]: *** [3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/build.make:132: 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/__/__/__/__/src/ggml-bitnet-mad.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:777: 3rdparty/llama.cpp/ggml/src/CMakeFiles/ggml.dir/all] Error 2
gmake: *** [Makefile:136: all] Error 2
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VERSION="10.1 (Coughlan)"
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VERSION_ID="10.1"
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ANSI_COLOR="0;31"
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Red Hat Enterprise Linux release 10.1 (Coughlan)
Red Hat Enterprise Linux release 10.1 (Coughlan)
clang version 20.1.8 (Red Hat, Inc. 20.1.8-1.el10)
Target: x86_64-redhat-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Configuration file: /etc/clang/x86_64-redhat-linux-gnu-clang.cfg
Error: building at STEP "RUN python setup_env.py -md models/BitNet-b1.58-2B-4T -q i2_s || (cat logs/compile.log && cat /etc/*release && clang --version && exit 1)": while running runtime: exit status 1