From: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
Operands on ANDN are swapped.
Tested with the following function:
long test_andn(long v1, long v2){
return (~v1 & v2);
}
Compiled with:
gcc kk.c -mbmi -O3 -Wall
0000000000000910 <test_andn>:
910:c4 e2 c0 f2 c6 andn %rsi,%rdi,%rax
915:c3 retq
916:66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1)
91d:00 00 00
and
gcc kk.c -march=native -O3 -Wall
0000000000000930 <test_andn>:
930: 48 f7 d7 not %rdi
933: 48 89 f8 mov %rdi,%rax
936: 48 21 f0 and %rsi,%rax
939: c3 retq
93a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
The test showed than -mbmi version behaved differently than the
-march native version.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
Message-Id: <20170713215137.5307-1-ricardo.riba...@gmail.com>
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
target/i386/translate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/i386/translate.c b/target/i386/translate.c
index dd464b98b0..96cd04c6de 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -3810,7 +3810,7 @@ static void gen_sse(CPUX86State *env, DisasContext *s,
int b,
}
ot = mo_64_32(s->dflag);
gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 0);
- tcg_gen_andc_tl(cpu_T0, cpu_regs[s->vex_v], cpu_T0);
+ tcg_gen_andc_tl(cpu_T0, cpu_T0, cpu_regs[s->vex_v]);
gen_op_mov_reg_v(ot, reg, cpu_T0);
gen_op_update1_cc();
set_cc_op(s, CC_OP_LOGICB + ot);
--
2.13.6
