From a1756896546fccf39eef6f282dcbd2f9292c1286 Mon Sep 17 00:00:00 2001 From: Richard Henderson 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 --- 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); -- GitLab