gwj / at91sam9263 · Commits

Commit 9db3ba4db28bae33d053752819c004ad28680bcc

Authored by aurel32
1 parent 13412c9d

TCG x86/x86-64: use move with zero-extend for loads/stores 

Starting with version 4.3, gcc returns the result of a function in
rax/eax/ax/al instead of rax/eax, depending of the return type. As
a consequence we should use a zero extend moe in TCG loads/stores.

See http://gcc.gnu.org/ml/gcc/2008-01/msg00052.html for more details.

A big thanks to malc who founds the problem and wrote the x86 patch.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6011 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 2 changed files with 12 additions and 0 deletions
tcg/i386/tcg-target.c
  View file @9db3ba4
... ... @@ -525,7 +525,13 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
525 525 tcg_out_modrm(s, 0xbf | P_EXT, data_reg, TCG_REG_EAX);
526 526 break;
527 527 case 0:
  528 + /* movzbl */
  529 + tcg_out_modrm(s, 0xb6 | P_EXT, data_reg, TCG_REG_EAX);
  530 + break;
528 531 case 1:
  532 + /* movzwl */
  533 + tcg_out_modrm(s, 0xb7 | P_EXT, data_reg, TCG_REG_EAX);
  534 + break;
529 535 case 2:
530 536 default:
531 537 tcg_out_mov(s, data_reg, TCG_REG_EAX);
... ...
tcg/x86_64/tcg-target.c
  View file @9db3ba4
... ... @@ -575,7 +575,13 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
575 575 tcg_out_modrm(s, 0x63 | P_REXW, data_reg, TCG_REG_RAX);
576 576 break;
577 577 case 0:
  578 + /* movzbq */
  579 + tcg_out_modrm(s, 0xb6 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
  580 + break;
578 581 case 1:
  582 + /* movzwq */
  583 + tcg_out_modrm(s, 0xb7 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
  584 + break;
579 585 case 2:
580 586 default:
581 587 /* movl */
... ...