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[PULL,01/11] tcg-s390: Fix off-by-one in wraparound andi

Message ID 1400171983-6015-2-git-send-email-rth@twiddle.net
State New
Headers show

Commit Message

Richard Henderson May 15, 2014, 4:39 p.m. UTC 
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/s390/tcg-target.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/tcg/s390/tcg-target.c b/tcg/s390/tcg-target.c
index ebdd074..0f972ae 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);