From: Richard Henderson <richard.henderson@linaro.org>
Date: Tue, 10 Dec 2024 03:13:02 +0000 (-0600)
Subject: tcg/optimize: Build and use z_bits and o_bits in fold_nor
X-Git-Tag: v10.1.0-rc0~39^2~21
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=682d6d57baf43c8f7273c328efa3402943bd557f;p=thirdparty%2Fqemu.git

tcg/optimize: Build and use z_bits and o_bits in fold_nor

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 758f7b142ee..29d1f29124e 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -2231,16 +2231,22 @@ static bool fold_neg(OptContext *ctx, TCGOp *op)
 
 static bool fold_nor(OptContext *ctx, TCGOp *op)
 {
-    uint64_t s_mask;
+    uint64_t z_mask, o_mask, s_mask;
+    TempOptInfo *t1, *t2;
 
     if (fold_const2_commutative(ctx, op) ||
         fold_xi_to_not(ctx, op, 0)) {
         return true;
     }
 
-    s_mask = arg_info(op->args[1])->s_mask
-           & arg_info(op->args[2])->s_mask;
-    return fold_masks_s(ctx, op, s_mask);
+    t1 = arg_info(op->args[1]);
+    t2 = arg_info(op->args[2]);
+
+    z_mask = ~(t1->o_mask | t2->o_mask);
+    o_mask = ~(t1->z_mask | t2->z_mask);
+    s_mask = t1->s_mask & t2->s_mask;
+
+    return fold_masks_zos(ctx, op, z_mask, o_mask, s_mask);
 }
 
 static bool fold_not(OptContext *ctx, TCGOp *op)