aboutsummaryrefslogtreecommitdiff
path: root/tcg
diff options
context:
space:
mode:
authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-13 18:57:21 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-13 18:57:21 +0000
commit9db3ba4db28bae33d053752819c004ad28680bcc (patch)
tree2d599da19ddd30ee474988d2f380ff07e980f5bb /tcg
parent13412c9d2fce7c402e93a08177abdbc593208140 (diff)
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
Diffstat (limited to 'tcg')
-rw-r--r--tcg/i386/tcg-target.c6
-rw-r--r--tcg/x86_64/tcg-target.c6
2 files changed, 12 insertions, 0 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index fa0a2ca913..2a6ee837af 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -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);
break;
case 0:
+ /* movzbl */
+ tcg_out_modrm(s, 0xb6 | P_EXT, data_reg, TCG_REG_EAX);
+ break;
case 1:
+ /* movzwl */
+ tcg_out_modrm(s, 0xb7 | P_EXT, data_reg, TCG_REG_EAX);
+ break;
case 2:
default:
tcg_out_mov(s, data_reg, TCG_REG_EAX);
diff --git a/tcg/x86_64/tcg-target.c b/tcg/x86_64/tcg-target.c
index 551ca78bb9..ce58fa17c1 100644
--- a/tcg/x86_64/tcg-target.c
+++ b/tcg/x86_64/tcg-target.c
@@ -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);
break;
case 0:
+ /* movzbq */
+ tcg_out_modrm(s, 0xb6 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
+ break;
case 1:
+ /* movzwq */
+ tcg_out_modrm(s, 0xb7 | P_EXT | P_REXW, data_reg, TCG_REG_RAX);
+ break;
case 2:
default:
/* movl */