With the introduction of tcg_gen_ext_tl, most uses can be converted directly
because they do not have a NULL destination.  tcg_gen_ext_tl is able to drop
no-ops like "tcg_gen_ext_tl(tcgv, tcgv, MO_TL)" just fine, and the only thing
that gen_ext_tl was adding on top was avoiding the creation of a useless
temporary.  This can be done in the only place where it matters, which is
gen_op_j_ecx.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/translate.c | 41 +++++++++++++++----------------------
 1 file changed, 17 insertions(+), 24 deletions(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index ee5ef3ccbc6..8089b502628 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -697,23 +697,16 @@ static inline TCGv gen_compute_Dshift(DisasContext *s, MemOp ot)
     return dshift;
 };
 
-static TCGv gen_ext_tl(TCGv dst, TCGv src, MemOp size, bool sign)
-{
-    if (size == MO_TL) {
-        return src;
-    }
-    if (!dst) {
-        dst = tcg_temp_new();
-    }
-    tcg_gen_ext_tl(dst, src, size | (sign ? MO_SIGN : 0));
-    return dst;
-}
-
 static void gen_op_j_ecx(DisasContext *s, TCGCond cond, TCGLabel *label1)
 {
-    TCGv tmp = gen_ext_tl(NULL, cpu_regs[R_ECX], s->aflag, false);
-
-    tcg_gen_brcondi_tl(cond, tmp, 0, label1);
+    TCGv lhs;
+    if (s->aflag == MO_TL) {
+        lhs = cpu_regs[R_ECX];
+    } else {
+        lhs = tcg_temp_new();
+        tcg_gen_ext_tl(lhs, cpu_regs[R_ECX], s->aflag);
+    }
+    tcg_gen_brcondi_tl(cond, lhs, 0, label1);
 }
 
 static inline void gen_op_jz_ecx(DisasContext *s, TCGLabel *label1)
@@ -886,16 +879,16 @@ static CCPrepare gen_prepare_eflags_c(DisasContext *s, TCGv reg)
     case CC_OP_SUBB ... CC_OP_SUBQ:
         /* (DATA_TYPE)CC_SRCT < (DATA_TYPE)CC_SRC */
         size = s->cc_op - CC_OP_SUBB;
-        gen_ext_tl(s->cc_srcT, s->cc_srcT, size, false);
-        gen_ext_tl(cpu_cc_src, cpu_cc_src, size, false);
+        tcg_gen_ext_tl(s->cc_srcT, s->cc_srcT, size);
+        tcg_gen_ext_tl(cpu_cc_src, cpu_cc_src, size);
         return (CCPrepare) { .cond = TCG_COND_LTU, .reg = s->cc_srcT,
                              .reg2 = cpu_cc_src, .use_reg2 = true };
 
     case CC_OP_ADDB ... CC_OP_ADDQ:
         /* (DATA_TYPE)CC_DST < (DATA_TYPE)CC_SRC */
         size = s->cc_op - CC_OP_ADDB;
-        gen_ext_tl(cpu_cc_dst, cpu_cc_dst, size, false);
-        gen_ext_tl(cpu_cc_src, cpu_cc_src, size, false);
+        tcg_gen_ext_tl(cpu_cc_dst, cpu_cc_dst, size);
+        tcg_gen_ext_tl(cpu_cc_src, cpu_cc_src, size);
         return (CCPrepare) { .cond = TCG_COND_LTU, .reg = cpu_cc_dst,
                              .reg2 = cpu_cc_src, .use_reg2 = true };
 
@@ -920,7 +913,7 @@ static CCPrepare gen_prepare_eflags_c(DisasContext *s, TCGv reg)
 
     case CC_OP_BMILGB ... CC_OP_BMILGQ:
         size = s->cc_op - CC_OP_BMILGB;
-        gen_ext_tl(cpu_cc_src, cpu_cc_src, size, false);
+        tcg_gen_ext_tl(cpu_cc_src, cpu_cc_src, size);
         return (CCPrepare) { .cond = TCG_COND_EQ, .reg = cpu_cc_src };
 
     case CC_OP_ADCX:
@@ -1048,8 +1041,8 @@ static CCPrepare gen_prepare_cc(DisasContext *s, int b, TCGv reg)
         size = s->cc_op - CC_OP_SUBB;
         switch (jcc_op) {
         case JCC_BE:
-            gen_ext_tl(s->cc_srcT, s->cc_srcT, size, false);
-            gen_ext_tl(cpu_cc_src, cpu_cc_src, size, false);
+            tcg_gen_ext_tl(s->cc_srcT, s->cc_srcT, size);
+            tcg_gen_ext_tl(cpu_cc_src, cpu_cc_src, size);
             cc = (CCPrepare) { .cond = TCG_COND_LEU, .reg = s->cc_srcT,
                                .reg2 = cpu_cc_src, .use_reg2 = true };
             break;
@@ -1059,8 +1052,8 @@ static CCPrepare gen_prepare_cc(DisasContext *s, int b, TCGv reg)
         case JCC_LE:
             cond = TCG_COND_LE;
         fast_jcc_l:
-            gen_ext_tl(s->cc_srcT, s->cc_srcT, size, true);
-            gen_ext_tl(cpu_cc_src, cpu_cc_src, size, true);
+            tcg_gen_ext_tl(s->cc_srcT, s->cc_srcT, size | MO_SIGN);
+            tcg_gen_ext_tl(cpu_cc_src, cpu_cc_src, size | MO_SIGN);
             cc = (CCPrepare) { .cond = cond, .reg = s->cc_srcT,
                                .reg2 = cpu_cc_src, .use_reg2 = true };
             break;
-- 
2.45.1

On 6/8/24 01:41, Paolo Bonzini wrote:
> With the introduction of tcg_gen_ext_tl, most uses can be converted directly
> because they do not have a NULL destination.  tcg_gen_ext_tl is able to drop
> no-ops like "tcg_gen_ext_tl(tcgv, tcgv, MO_TL)" just fine, and the only thing
> that gen_ext_tl was adding on top was avoiding the creation of a useless
> temporary.  This can be done in the only place where it matters, which is
> gen_op_j_ecx.
> 
> Signed-off-by: Paolo Bonzini<pbonzini@redhat.com>
> ---
>   target/i386/tcg/translate.c | 41 +++++++++++++++----------------------
>   1 file changed, 17 insertions(+), 24 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~