Handle it like the other arithmetic cc_ops. This simplifies a
bit the implementation of bit test instructions.
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/cpu.h | 13 +++++++++++--
target/i386/tcg/translate.c | 3 +--
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 1b4edbe0580..29daf370485 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1275,6 +1275,7 @@ typedef enum {
CC_OP_ADCX, /* CC_DST = C, CC_SRC = rest. */
CC_OP_ADOX, /* CC_SRC2 = O, CC_SRC = rest. */
CC_OP_ADCOX, /* CC_DST = C, CC_SRC2 = O, CC_SRC = rest. */
+ CC_OP_CLR, /* Z and P set, all other flags clear. */
CC_OP_MULB, /* modify all flags, C, O = (CC_SRC != 0) */
CC_OP_MULW,
@@ -1331,8 +1332,16 @@ typedef enum {
CC_OP_BMILGL,
CC_OP_BMILGQ,
- CC_OP_CLR, /* Z set, all other flags clear. */
- CC_OP_POPCNT, /* Z via CC_DST, all other flags clear. */
+ /*
+ * Note that only CC_OP_POPCNT (i.e. the one with MO_TL size)
+ * is used or implemented, because the translation needs
+ * to zero-extend CC_DST anyway.
+ */
+ CC_OP_POPCNTB__, /* Z via CC_DST, all other flags clear. */
+ CC_OP_POPCNTW__,
+ CC_OP_POPCNTL__,
+ CC_OP_POPCNTQ__,
+ CC_OP_POPCNT = sizeof(target_ulong) == 8 ? CC_OP_POPCNTQ__ :
CC_OP_POPCNTL__,
CC_OP_NB,
} CCOp;
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index eb353dc3c9f..934c514e64f 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -1019,8 +1019,6 @@ static CCPrepare gen_prepare_eflags_z(DisasContext *s,
TCGv reg)
.imm = CC_Z };
case CC_OP_CLR:
return (CCPrepare) { .cond = TCG_COND_ALWAYS };
- case CC_OP_POPCNT:
- return (CCPrepare) { .cond = TCG_COND_EQ, .reg = cpu_cc_dst };
default:
{
MemOp size = (s->cc_op - CC_OP_ADDB) & 3;
@@ -3177,6 +3175,7 @@ static void disas_insn_old(DisasContext *s, CPUState
*cpu, int b)
case CC_OP_SHLB ... CC_OP_SHLQ:
case CC_OP_SARB ... CC_OP_SARQ:
case CC_OP_BMILGB ... CC_OP_BMILGQ:
+ case CC_OP_POPCNT:
/* Z was going to be computed from the non-zero status of CC_DST.
We can get that same Z value (and the new C value) by leaving
CC_DST alone, setting CC_SRC, and using a CC_OP_SAR of the
--
2.45.2
