From: Richard Henderson <richard.henderson@linaro.org>
Date: Thu, 1 Aug 2024 07:42:36 +0000 (+1000)
Subject: target/i386: Split out gen_prepare_val_nz
X-Git-Tag: qemu-xen-4.20.0~9^2~2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=266d6dddbd85286e64004499f6f8f6fad15e5521;p=qemu-xen.git

target/i386: Split out gen_prepare_val_nz

Split out the TCG_COND_TSTEQ logic from gen_prepare_eflags_z,
and use it for CC_OP_BMILG* as well.  Prepare for requiring
both zero and non-zero senses.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240801075845.573075-2-richard.henderson@linaro.org>
---

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index b72864bf01..4af282e626 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -865,6 +865,18 @@ static CCPrepare gen_prepare_sign_nz(TCGv src, MemOp size)
     }
 }
 
+static CCPrepare gen_prepare_val_nz(TCGv src, MemOp size, bool eqz)
+{
+    if (size == MO_TL) {
+        return (CCPrepare) { .cond = eqz ? TCG_COND_EQ : TCG_COND_NE,
+                             .reg = src };
+    } else {
+        return (CCPrepare) { .cond = eqz ? TCG_COND_TSTEQ : TCG_COND_TSTNE,
+                             .imm = MAKE_64BIT_MASK(0, 8 << size),
+                             .reg = src };
+    }
+}
+
 /* compute eflags.C, trying to store it in reg if not NULL */
 static CCPrepare gen_prepare_eflags_c(DisasContext *s, TCGv reg)
 {
@@ -908,8 +920,7 @@ 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);
-        return (CCPrepare) { .cond = TCG_COND_EQ, .reg = cpu_cc_src };
+        return gen_prepare_val_nz(cpu_cc_src, size, true);
 
     case CC_OP_ADCX:
     case CC_OP_ADCOX:
@@ -1006,12 +1017,7 @@ static CCPrepare gen_prepare_eflags_z(DisasContext *s, TCGv reg)
     default:
         {
             MemOp size = (s->cc_op - CC_OP_ADDB) & 3;
-            if (size == MO_TL) {
-                return (CCPrepare) { .cond = TCG_COND_EQ, .reg = cpu_cc_dst };
-            } else {
-                return (CCPrepare) { .cond = TCG_COND_TSTEQ, .reg = cpu_cc_dst,
-                                     .imm = (1ull << (8 << size)) - 1 };
-            }
+            return gen_prepare_val_nz(cpu_cc_dst, size, true);
         }
     }
 }