[Bug target/112962] [14 Regression] ICE: SIGSEGV in operator() (recog.h:431) with -fexceptions -mssse3 and __builtin_ia32_pabsd128()

[ubizjak at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112962

--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> I was thinking whether it wouldn't be better to expand x86 const or pure
> builtins when lhs is ignored to nothing in the expanders.

Something like this?

--cut here--
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index a53d69d5400..0f3d6108d77 100644
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -13032,6 +13032,9 @@ ix86_expand_builtin (tree exp, rtx target, rtx
subtarget,
   unsigned int fcode = DECL_MD_FUNCTION_CODE (fndecl);
   HOST_WIDE_INT bisa, bisa2;

+  if (ignore && (TREE_READONLY (fndecl) || DECL_PURE_P (fndecl)))
+    return const0_rtx;
+
   /* For CPU builtins that can be folded, fold first and expand the fold.  */
   switch (fcode)
     {
@@ -14401,9 +14404,6 @@ rdseed_step:
       return target;

     case IX86_BUILTIN_READ_FLAGS:
-      if (ignore)
-       return const0_rtx;
-
       emit_insn (gen_pushfl ());

       if (optimize
--cut here--