From a1756896546fccf39eef6f282dcbd2f9292c1286 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Thu, 15 May 2014 00:09:47 -0400
Subject: [PATCH] tcg-s390: Fix off-by-one in wraparound andi
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
tcg/s390/tcg-target.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tcg/s390/tcg-target.c b/tcg/s390/tcg-target.c
index ebdd0743cf..0f972ae5df 100644
--- a/tcg/s390/tcg-target.c
+++ b/tcg/s390/tcg-target.c
@@ -983,8 +983,8 @@ static void tgen_andi(TCGContext *s, TCGType type, TCGReg dest, uint64_t val)
int msb, lsb;
if ((val & 0x8000000000000001ull) == 0x8000000000000001ull) {
/* Achieve wraparound by swapping msb and lsb. */
- msb = 63 - ctz64(~val);
- lsb = clz64(~val) + 1;
+ msb = 64 - ctz64(~val);
+ lsb = clz64(~val) - 1;
} else {
msb = clz64(val);
lsb = 63 - ctz64(val);
--
2.30.2