From: Richard Henderson <richard.henderson@linaro.org>
Date: Thu, 26 Aug 2021 20:20:39 +0000 (-0700)
Subject: tcg/optimize: Propagate sign info for setcond
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=275d7d8e70ef8679e241ce78c83548067f403394;p=qemu.git

tcg/optimize: Propagate sign info for setcond

The result is either 0 or 1, which means that we have
a 2 bit signed result, and thus 62 bits of sign.
For clarity, use the smask_from_zmask function.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/optimize.c b/tcg/optimize.c
index de1abd9cc3..5fa4d7285d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1730,6 +1730,7 @@ static bool fold_setcond(OptContext *ctx, TCGOp *op)
     }
 
     ctx->z_mask = 1;
+    ctx->s_mask = smask_from_zmask(1);
     return false;
 }
 
@@ -1802,6 +1803,7 @@ static bool fold_setcond2(OptContext *ctx, TCGOp *op)
     }
 
     ctx->z_mask = 1;
+    ctx->s_mask = smask_from_zmask(1);
     return false;
 
  do_setcond_const: