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authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-10 21:27:15 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2009-04-10 21:27:15 +0000
commitecbb5ea1041d2894f5efb9317acd519c4fd81ad5 (patch)
tree72cd66d31fdd2c87d191f3be9c84f4f72a2b20a7 /target-alpha
parent68238a9e90708740200e652631ee1356dd55147d (diff)
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target-alpha: overflow condition for sublv and subqv
The conditions to detect overflow in sub operations was wrong. This patch is necessary to boot Tru64. Signed-off-by: Tristan Gingold <gingold@adacore.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7073 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'target-alpha')
-rw-r--r--target-alpha/op_helper.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
index 7ad1b3d..e61fa73 100644
--- a/target-alpha/op_helper.c
+++ b/target-alpha/op_helper.c
@@ -158,22 +158,22 @@ uint64_t helper_addlv (uint64_t op1, uint64_t op2)
uint64_t helper_subqv (uint64_t op1, uint64_t op2)
{
- uint64_t tmp = op1;
- op1 -= op2;
- if (unlikely(((~tmp) ^ op1 ^ (-1ULL)) & ((~tmp) ^ op2) & (1ULL << 63))) {
+ uint64_t res;
+ res = op1 - op2;
+ if (unlikely((op1 ^ op2) & (res ^ op1) & (1ULL << 63))) {
helper_excp(EXCP_ARITH, EXCP_ARITH_OVERFLOW);
}
- return op1;
+ return res;
}
uint64_t helper_sublv (uint64_t op1, uint64_t op2)
{
- uint64_t tmp = op1;
- op1 = (uint32_t)(op1 - op2);
- if (unlikely(((~tmp) ^ op1 ^ (-1UL)) & ((~tmp) ^ op2) & (1UL << 31))) {
+ uint32_t res;
+ res = op1 - op2;
+ if (unlikely((op1 ^ op2) & (res ^ op1) & (1UL << 31))) {
helper_excp(EXCP_ARITH, EXCP_ARITH_OVERFLOW);
}
- return op1;
+ return res;
}
uint64_t helper_mullv (uint64_t op1, uint64_t op2)