Blame SOURCES/ck-register-constraint.patch
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commit b02bb2b805c970e6ef90e8e15daafa5d78cb195f
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Author: Paul Khuong <pvk@google.com>
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Date: Wed Aug 21 10:08:10 2019 -0400
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x86/ck_pr: fix register constraint for ck_pr_foo_is_zero
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setcc works with byte registers, so we want `q` to ensure
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the low byte register is encodable, not the general `r`.
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Fixes https://github.com/concurrencykit/ck/issues/142.
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diff --git a/include/gcc/x86/ck_pr.h b/include/gcc/x86/ck_pr.h
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index e678e83..8ef8864 100644
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--- a/include/gcc/x86/ck_pr.h
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+++ b/include/gcc/x86/ck_pr.h
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@@ -239,7 +239,7 @@ CK_PR_FAA_S(8, uint8_t, "xaddb")
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bool ret; \
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__asm__ __volatile__(CK_PR_LOCK_PREFIX I " %0; setz %1" \
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: "+m" (*(C *)target), \
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- "=rm" (ret) \
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+ "=qm" (ret) \
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: \
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: "memory", "cc"); \
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return ret; \
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@@ -354,7 +354,7 @@ CK_PR_CAS_S(8, uint8_t, "cmpxchgb")
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: "q" (set), \
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"a" (compare) \
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: "memory", "cc"); \
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- return (bool)z; \
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+ return z; \
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}
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CK_PR_CAS_O(ptr, void, void *, char, "l", "eax")
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