[gcc r15-2394] i386: Add non-optimize prefetchi intrins

[Haochen Jiang via Gcc-cvs]

https://gcc.gnu.org/g:b4524c4430ba9771265bd9fc31e69a3f35dfe117

commit r15-2394-gb4524c4430ba9771265bd9fc31e69a3f35dfe117
Author: Haochen Jiang <haochen.ji...@intel.com>
Date:   Thu Jul 25 16:16:05 2024 +0800

    i386: Add non-optimize prefetchi intrins
    
    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.
    
    gcc/ChangeLog:
    
            * config/i386/prfchiintrin.h
            (_m_prefetchit0): Add macro for non-optimized option.
            (_m_prefetchit1): Ditto.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/i386/prefetchi-1b.c: New test.

Diff:
---
 gcc/config/i386/prfchiintrin.h               |  9 +++++++++
 gcc/testsuite/gcc.target/i386/prefetchi-1b.c | 26 ++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/gcc/config/i386/prfchiintrin.h b/gcc/config/i386/prfchiintrin.h
index dfca89c7d169..d6580e504c04 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__
diff --git a/gcc/testsuite/gcc.target/i386/prefetchi-1b.c 
b/gcc/testsuite/gcc.target/i386/prefetchi-1b.c
new file mode 100644
index 000000000000..93139554d3cd
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/prefetchi-1b.c
@@ -0,0 +1,26 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-mprefetchi -O0" } */
+/* { dg-final { scan-assembler-times "\[ \\t\]+prefetchit0\[ 
\\t\]+bar\\(%rip\\)" 1 } } */
+/* { dg-final { scan-assembler-times "\[ \\t\]+prefetchit1\[ 
\\t\]+bar\\(%rip\\)" 1 } } */
+
+#include <x86intrin.h>
+
+int
+bar (int a)
+{
+  return a + 1;
+}
+
+int
+foo1 (int b)
+{
+  _m_prefetchit0 (bar);
+  return bar (b) + 1;
+}
+
+int
+foo2 (int b)
+{
+  _m_prefetchit1 (bar);
+  return bar (b) + 1;
+}