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ggml: Correct SVE implementation in ggml_vec_dot_f16_unroll (#16518)

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The previous SVE implementation for `ggml_vec_dot_f16_unroll` contained a bug due to a copy-paste error. The wrong variable was used in an FMA instruction, leading to incorrect results. This commit corrects the variable usage and improves the clarity of the code by renaming variables to avoid confusion.

Co-authored-by: Aaron <shelhamer.aaron@gmail.com>
This commit is contained in:
sirus20x6
2025-10-12 00:15:00 -05:00
committed by GitHub
parent 11f0af5504
commit 20cc625edc
1 changed files with 3 additions and 3 deletions
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6
ggml/src/ggml-cpu/vec.h
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@@ -144,14 +144,14 @@ inline static void ggml_vec_dot_f16_unroll(const int n, const int xs, float * GG
for (int i = 0; i < np; i += ggml_f16_step) {
ay1 = GGML_F16x_VEC_LOAD(y + i + 0 * ggml_f16_epr, 0); // 8 elements
ax1 = GGML_F16x_VEC_LOAD(x[0] + i + 0*ggml_f16_epr, 0); // 8 elemnst
ax1 = GGML_F16x_VEC_LOAD(x[0] + i + 0*ggml_f16_epr, 0); // 8 elements
sum_00 = GGML_F16x_VEC_FMA(sum_00, ax1, ay1); // sum_00 = sum_00+ax1*ay1
ax1 = GGML_F16x_VEC_LOAD(x[1] + i + 0*ggml_f16_epr, 0); // 8 elements
sum_10 = GGML_F16x_VEC_FMA(sum_10, ax1, ay1);
ay2 = GGML_F16x_VEC_LOAD(y + i + 1 * ggml_f16_epr, 1); // next 8 elements
ax2 = GGML_F16x_VEC_LOAD(x[0] + i + 1*ggml_f16_epr, 1); // next 8 ekements
ax2 = GGML_F16x_VEC_LOAD(x[0] + i + 1*ggml_f16_epr, 1); // next 8 elements
sum_01 = GGML_F16x_VEC_FMA(sum_01, ax2, ay2);
ax2 = GGML_F16x_VEC_LOAD(x[1] + i + 1*ggml_f16_epr, 1);
sum_11 = GGML_F16x_VEC_FMA(sum_11, ax2, ay2);
@@ -160,7 +160,7 @@ inline static void ggml_vec_dot_f16_unroll(const int n, const int xs, float * GG
ax3 = GGML_F16x_VEC_LOAD(x[0] + i + 2*ggml_f16_epr, 2);
sum_02 = GGML_F16x_VEC_FMA(sum_02, ax3, ay3);
ax1 = GGML_F16x_VEC_LOAD(x[1] + i + 2*ggml_f16_epr, 2);
ax3 = GGML_F16x_VEC_LOAD(x[1] + i + 2*ggml_f16_epr, 2);
sum_12 = GGML_F16x_VEC_FMA(sum_12, ax3, ay3);
ay4 = GGML_F16x_VEC_LOAD(y + i + 3 * ggml_f16_epr, 3);