Hi all,
Under -O0, with the "newly" introduced intrins, the variable will be
transformed as mem instead of the origin symbol_ref. The compiler will
then treat the operand as invalid and turn the operation into nop, which
is not expected. Use macro for non-optimize to keep the variable as
symbol_ref just as how prefetch intrin does.
Bootstrapped and regtested on x86-64-pc-linux-gnu. Ok for trunk and backport
to GCC 14 and GCC 13?
Thx,
Haochen
---
gcc/config/i386/prfchiintrin.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/gcc/config/i386/prfchiintrin.h b/gcc/config/i386/prfchiintrin.h
index dfca89c7d16..d6580e504c0 100644
--- a/gcc/config/i386/prfchiintrin.h
+++ b/gcc/config/i386/prfchiintrin.h
@@ -37,6 +37,7 @@
#define __DISABLE_PREFETCHI__
#endif /* __PREFETCHI__ */
+#ifdef __OPTIMIZE__
extern __inline void
__attribute__((__gnu_inline__, __always_inline__, __artificial__))
_m_prefetchit0 (void* __P)
@@ -50,6 +51,14 @@ _m_prefetchit1 (void* __P)
{
__builtin_ia32_prefetchi (__P, 2);
}
+#else
+#define _m_prefetchit0(P) \
+ __builtin_ia32_prefetchi(P, 3);
+
+#define _m_prefetchit1(P) \
+ __builtin_ia32_prefetchi(P, 2);
+
+#endif
#ifdef __DISABLE_PREFETCHI__
#undef __DISABLE_PREFETCHI__
--
2.31.1
