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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
This commit is contained in:
aurel32 2008-12-13 18:57:21 +00:00
parent 13412c9d2f
commit 9db3ba4db2
2 changed files with 12 additions and 0 deletions
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6
tcg/i386/tcg-target.c
View File

@ -525,7 +525,13 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_modrm(s, 0xbf | P_EXT, data_reg, TCG_REG_EAX); tcg_out_modrm(s, 0xbf | P_EXT, data_reg, TCG_REG_EAX);
break; break;
case 0: case 0:
/* movzbl */
tcg_out_modrm(s, 0xb6 | P_EXT, data_reg, TCG_REG_EAX);
break;
case 1: case 1:
/* movzwl */
tcg_out_modrm(s, 0xb7 | P_EXT, data_reg, TCG_REG_EAX);
break;
case 2: case 2:
default: default:
tcg_out_mov(s, data_reg, TCG_REG_EAX); tcg_out_mov(s, data_reg, TCG_REG_EAX);

6
tcg/x86_64/tcg-target.c
View File

@ -575,7 +575,13 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_modrm(s, 0x63 | P_REXW, data_reg, TCG_REG_RAX); tcg_out_modrm(s, 0x63 | P_REXW, data_reg, TCG_REG_RAX);
break; break;
case 0: case 0:
/* movzbq */
tcg_out_modrm(s, 0xb6 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
break;
case 1: case 1:
/* movzwq */
tcg_out_modrm(s, 0xb7 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
break;
case 2: case 2:
default: default:
/* movl */ /* movl */