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target-alpha: Fix cvttq vs large integers 

The range +- 2**63 - 2**64 was returning the wrong truncated
result.  We also incorrectly signaled overflow for -2**63.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-07-03 12:36:34 -07:00
parent c24a8a0b6d
commit 7f2e40020c
1 changed files with 5 additions and 5 deletions
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10
target-alpha/fpu_helper.c
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@ -453,12 +453,12 @@ static uint64_t do_cvttq(CPUAlphaState *env, uint64_t a, int roundmode)
if (shift >= 0) {
/* In this case the number is so large that we must shift
the fraction left. There is no rounding to do. */
exc = FPCR_IOV | FPCR_INE;
if (shift < 63) {
if (shift < 64) {
ret = frac << shift;
if ((ret >> shift) == frac) {
exc = 0;
}
}
/* Check for overflow. Note the special case of -0x1p63. */
if (shift >= 11 && a != 0xC3E0000000000000ull) {
exc = FPCR_IOV | FPCR_INE;
}
} else {
uint64_t round;