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Fix undefined shifts and abs in Alpha backend. Based on patch by Ahmed Charles.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141909 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2011-10-13 23:13:35 +00:00
parent 7d2bc08254
commit 5bd7ff2128
1 changed files with 3 additions and 4 deletions
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7
lib/Target/Alpha/AlphaISelDAGToDAG.cpp
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@@ -80,7 +80,7 @@ namespace {
// Otherwise we don't know that the it's okay to zapnot this entire // Otherwise we don't know that the it's okay to zapnot this entire
// byte. Only do this iff we can prove that the missing bits are // byte. Only do this iff we can prove that the missing bits are
// already null, so the bytezap doesn't need to really null them. // already null, so the bytezap doesn't need to really null them.
BitsToCheck |= ~Constant & (0xFF << 8*i); BitsToCheck |= ~Constant & (0xFFULL << 8*i);
} }
} }
} }
@@ -114,9 +114,8 @@ namespace {
if (!x) return 0; if (!x) return 0;
unsigned at = CountLeadingZeros_64(x); unsigned at = CountLeadingZeros_64(x);
uint64_t complow = 1ULL << (63 - at); uint64_t complow = 1ULL << (63 - at);
uint64_t comphigh = 1ULL << (64 - at); uint64_t comphigh = complow << 1;
//cerr << x << ":" << complow << ":" << comphigh << "\n"; if (x - complow <= comphigh - x)
if (abs64(complow - x) <= abs64(comphigh - x))
return complow; return complow;
else else
return comphigh; return comphigh;