diff mbox series

i386: Add non-optimize prefetchi intrins

Message ID 20240726063348.3859413-1-haochen.jiang@intel.com
State New
Headers show
Series i386: Add non-optimize prefetchi intrins | expand

Commit Message

Haochen Jiang July 26, 2024, 6:33 a.m. UTC 
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 mbox series

Patch

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__