i386: Use no-mmx,no-sse for LIBGCC2_UNWIND_ATTRIBUTE [PR104890]

Regardless of the outcome of the general-regs-only stuff in x86gprintrin.h,
apparently general-regs-only is much bigger hammer than no-sse, and e.g.
using 387 instructions in the unwinder isn't a big deal, it never needs
to realign the stack because of it.

So, the following patch uses no-sse (and adds no-mmx to it, even when not
strictly needed).

2022-03-15  Jakub Jelinek  <jakub@redhat.com>

	PR target/104890
	* config/i386/i386.h (LIBGCC2_UNWIND_ATTRIBUTE): Use no-mmx,no-sse
	instead of general-regs-only.

diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 0d28e57..37b523c 100644 (file)
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -2848,10 +2848,10 @@ extern enum attr_cpu ix86_schedule;
 #define NUM_X86_64_MS_CLOBBERED_REGS 12
 #endif
 
-/* __builtin_eh_return can't handle stack realignment, so restrict to
-   general regs in 32-bit libgcc functions that call it.  */
+/* __builtin_eh_return can't handle stack realignment, so disable MMX/SSE
+   in 32-bit libgcc functions that call it.  */
 #ifndef __x86_64__
-#define LIBGCC2_UNWIND_ATTRIBUTE __attribute__((target ("general-regs-only")))
+#define LIBGCC2_UNWIND_ATTRIBUTE __attribute__((target ("no-mmx,no-sse")))
 #endif
 
 /*