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Add vector registers to clobber list to prevent compiler optimization. #5203

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Merged
martin-frbg merged 1 commit into from
May 9, 2025
Merged

Add vector registers to clobber list to prevent compiler optimization. #5203

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21 changes: 18 additions & 3 deletions kernel/arm64/sgemm_direct_arm64_sme1.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@
#include <stdlib.h>
#include <inttypes.h>
#include <math.h>

#if defined(HAVE_SME)

/* Function prototypes */
Expand Down Expand Up @@ -44,15 +43,31 @@ void CNAME (BLASLONG M, BLASLONG N, BLASLONG K, float * __restrict A,\
m_mod = ceil((double)M/(double)vl_elms) * vl_elms;

float *A_mod = (float *) malloc(m_mod*K*sizeof(float));


/* Prevent compiler optimization by reading from memory instead
* of reading directly from vector (z) registers.
* */
asm volatile("" : : :"p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7",
"p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15",
"z0", "z1", "z2", "z3", "z4", "z5", "z6", "z7",
"z8", "z9", "z10", "z11", "z12", "z13", "z14", "z15",
"z16", "z17", "z18", "z19", "z20", "z21", "z22", "z23",
"z24", "z25", "z26", "z27", "z28", "z29", "z30", "z31");

/* Pre-process the left matrix to make it suitable for
matrix sum of outer-product calculation
*/
sgemm_direct_sme1_preprocess(M, K, A, A_mod);

/* Calculate C = A*B */
sgemm_direct_sme1_2VLx2VL(M, K, N, A_mod, B, R);


asm volatile("" : : :"p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7",
"p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15",
"z0", "z1", "z2", "z3", "z4", "z5", "z6", "z7",
"z8", "z9", "z10", "z11", "z12", "z13", "z14", "z15",
"z16", "z17", "z18", "z19", "z20", "z21", "z22", "z23",
"z24", "z25", "z26", "z27", "z28", "z29", "z30", "z31");
free(A_mod);
}

Expand Down
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