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[Qemu-devel] [PATCH v2 08/11] target/ppc: update ov/ov32 for nego


From: Nikunj A Dadhania
Subject: [Qemu-devel] [PATCH v2 08/11] target/ppc: update ov/ov32 for nego
Date: Wed, 22 Feb 2017 14:59:45 +0530

For 64-bit mode if the register RA contains 0x8000_0000_0000_0000, OV
and OV32 are set to 1.

For 32-bit mode if the register RA contains 0x8000_0000, OV and OV32 are
set to 1.

Use the tcg-ops for negation (neg_tl) and drop gen_op_arith_neg() as
nego was the last user.

Signed-off-by: Nikunj A Dadhania <address@hidden>
---
 target/ppc/translate.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index eecdfe9..2a9f508 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -1473,14 +1473,6 @@ static void gen_subfic(DisasContext *ctx)
 }
 
 /* neg neg. nego nego. */
-static inline void gen_op_arith_neg(DisasContext *ctx, bool compute_ov)
-{
-    TCGv zero = tcg_const_tl(0);
-    gen_op_arith_subf(ctx, cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],
-                      zero, 0, 0, compute_ov, Rc(ctx->opcode));
-    tcg_temp_free(zero);
-}
-
 static void gen_neg(DisasContext *ctx)
 {
     tcg_gen_neg_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
@@ -1491,7 +1483,23 @@ static void gen_neg(DisasContext *ctx)
 
 static void gen_nego(DisasContext *ctx)
 {
-    gen_op_arith_neg(ctx, 1);
+    TCGv t0 = tcg_temp_new();
+    TCGv zero = tcg_const_tl(0);
+
+    if (NARROW_MODE(ctx)) {
+        tcg_gen_xori_tl(t0, cpu_gpr[rA(ctx->opcode)], INT32_MIN);
+    } else {
+        tcg_gen_xori_tl(t0, cpu_gpr[rA(ctx->opcode)], (target_ulong)INT64_MIN);
+    }
+
+    tcg_gen_setcond_tl(TCG_COND_EQ, cpu_ov, t0, zero);
+    tcg_gen_mov_tl(cpu_ov32, cpu_ov);
+    tcg_gen_neg_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)]);
+    if (unlikely(Rc(ctx->opcode))) {
+        gen_set_Rc0(ctx, cpu_gpr[rD(ctx->opcode)]);
+    }
+    tcg_temp_free(t0);
+    tcg_temp_free(zero);
 }
 
 /***                            Integer logical                            ***/
-- 
2.7.4




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