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Merge pull request #2468 from AGSaidi/wfe
Use wait-for-event to not spin in the blas_lock
tags/v0.3.9
Martin Kroeker
GitHub
5 years ago
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with
4 additions and
4 deletions
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common_arm64.h
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@@ -53,16 +53,16 @@ static void __inline blas_lock(volatile BLASULONG *address){ |
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BLASULONG ret; |
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do { |
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while (*address) {YIELDING;}; |
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__asm__ __volatile__( |
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"mov x4, #1 \n\t" |
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"sevl \n\t" |
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"1: \n\t" |
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"wfe \n\t" |
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"2: \n\t" |
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"ldaxr x2, [%1] \n\t" |
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"cbnz x2, 1b \n\t" |
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"2: \n\t" |
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"stxr w3, x4, [%1] \n\t" |
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"cbnz w3, 1b \n\t" |
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"cbnz w3, 2b \n\t" |
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"mov %0, #0 \n\t" |
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: "=r"(ret), "=r"(address) |
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: "1"(address) |
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