On 6/8/24 01:40, Paolo Bonzini wrote:
Avoid using set_cc_op() in preparation for implementing APX; treat
CC_OP_EFLAGS similar to the case where we have the "opposite" cc_op
(CC_OP_ADOX for ADCX and CC_OP_ADCX for ADOX), except the resulting
cc_op is not CC_OP_ADCOX. This is written easily as two "if"s, whose
conditions are both false for CC_OP_EFLAGS, both true for CC_OP_ADCOX,
and one each true for CC_OP_ADCX/ADOX.
The new logic also makes it easy to drop usage of tmp0.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/cpu.h | 9 +++---
target/i386/tcg/emit.c.inc | 61 ++++++++++++++++++++++----------------
2 files changed, 40 insertions(+), 30 deletions(-)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 8fe28b67e0f..ee873a0ed84 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1260,6 +1260,8 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
/* Use a clearer name for this. */
#define CPU_INTERRUPT_INIT CPU_INTERRUPT_RESET
+#define CC_OP_HAS_EFLAGS(op) ((op) >= CC_OP_EFLAGS && (op) <= CC_OP_ADCOX)
+
/* Instead of computing the condition codes after each x86 instruction,
* QEMU just stores one operand (called CC_SRC), the result
* (called CC_DST) and the type of operation (called CC_OP). When the
@@ -1270,6 +1272,9 @@ uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
typedef enum {
CC_OP_DYNAMIC, /* must use dynamic code to get cc_op */
CC_OP_EFLAGS, /* all cc are explicitly computed, CC_SRC = flags */
+ CC_OP_ADCX, /* CC_DST = C, CC_SRC = rest. */
+ CC_OP_ADOX, /* CC_DST = O, CC_SRC = rest. */
+ CC_OP_ADCOX, /* CC_DST = C, CC_SRC2 = O, CC_SRC = rest. */
Comment for ADOX is (and was) wrong -- SRC2 = O.
That made review a bit confusing... :-)
Otherwise,
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
r~
