[Bug target/95740] Failure to avoid using the stack when interpreting a float as an integer when it is modified afterwards

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95740

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
It can be fixed by

2 files changed, 4 insertions(+), 2 deletions(-)
gcc/config/i386/i386.c | 2 +-
gcc/config/i386/i386.h | 4 +++-

modified   gcc/config/i386/i386.c
@@ -19194,7 +19194,7 @@ ix86_preferred_reload_class (rtx x, reg_class_t
regclass)

   /* Prefer SSE regs only, if we can use them for math.  */
   if (SSE_FLOAT_MODE_P (mode) && TARGET_SSE_MATH)
-    return SSE_CLASS_P (regclass) ? regclass : NO_REGS;
+    return INT_SSE_CLASS_P (regclass) ? regclass : NO_REGS;

   /* Generally when we see PLUS here, it's the function invariant
      (plus soft-fp const_int).  Which can only be computed into general
modified   gcc/config/i386/i386.h
@@ -1283,7 +1283,9 @@ enum reg_class
   reg_class_subset_p ((CLASS), FLOAT_REGS)
 #define SSE_CLASS_P(CLASS) \
   reg_class_subset_p ((CLASS), ALL_SSE_REGS)
-#define MMX_CLASS_P(CLASS) \
+#define INT_SSE_CLASS_P(CLASS) \
+  reg_class_subset_p ((CLASS), INT_SSE_REGS)
+#define MMX_CLASS_P(CLASS)                     \
   ((CLASS) == MMX_REGS)
 #define MASK_CLASS_P(CLASS) \
   reg_class_subset_p ((CLASS), ALL_MASK_REGS)

I'm testing performance impact.