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Merge pull request #2468 from AGSaidi/wfe 

Use wait-for-event to not spin in the blas_lock
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Martin Kroeker 2020-03-01 19:40:46 +01:00 committed by GitHub
parent 69d4687142 0af9991cc9
commit e94590e400
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1 changed files with 4 additions and 4 deletions
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8
common_arm64.h
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@ -53,16 +53,16 @@ static void __inline blas_lock(volatile BLASULONG *address){
BLASULONG ret; BLASULONG ret;
do { do {
while (*address) {YIELDING;};
__asm__ __volatile__( __asm__ __volatile__(
"mov x4, #1 \n\t" "mov x4, #1 \n\t"
"sevl \n\t"
"1: \n\t" "1: \n\t"
"wfe \n\t"
"2: \n\t"
"ldaxr x2, [%1] \n\t" "ldaxr x2, [%1] \n\t"
"cbnz x2, 1b \n\t" "cbnz x2, 1b \n\t"
"2: \n\t"
"stxr w3, x4, [%1] \n\t" "stxr w3, x4, [%1] \n\t"
"cbnz w3, 1b \n\t" "cbnz w3, 2b \n\t"
"mov %0, #0 \n\t" "mov %0, #0 \n\t"
: "=r"(ret), "=r"(address) : "=r"(ret), "=r"(address)
: "1"(address) : "1"(address)