svn commit: r354775 - head/sys/powerpc/booke

[Justin Hibbits]

Author: jhibbits
Date: Sat Nov 16 16:27:31 2019
New Revision: 354775
URL: https://svnweb.freebsd.org/changeset/base/354775

Log:
  powerpcspe: Mark asm statement in spe_save_reg_high as clobbering memory
  
  Modern gcc errors that "'vec[0]' is used uninitialized in this function"
  without us telling it that vec is clobbered.  Neither clang nor gcc 4.2.1
  error on the existing construct.
  
  Submitted by:	bdragon

Modified:
  head/sys/powerpc/booke/spe.c

Modified: head/sys/powerpc/booke/spe.c
==============================================================================
--- head/sys/powerpc/booke/spe.c	Sat Nov 16 12:00:22 2019	(r354774)
+++ head/sys/powerpc/booke/spe.c	Sat Nov 16 16:27:31 2019	(r354775)
@@ -426,7 +426,7 @@ spe_save_reg_high(int reg)
 {
 	uint32_t vec[2];
 #define EVSTDW(n)   case n: __asm __volatile ("evstdw %1,0(%0)" \
-		:: "b"(vec), "n"(n)); break;
+		:: "b"(vec), "n"(n) : "memory"); break;
 	switch (reg) {
 	EVSTDW(0);	EVSTDW(1);	EVSTDW(2);	EVSTDW(3);
 	EVSTDW(4);	EVSTDW(5);	EVSTDW(6);	EVSTDW(7);