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Fix address calculation error from r155744.

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This was exposed by SingleSource/UnitTests/Vector/constpool.c.

The computed size of a basic block isn't always a multiple of its known
alignment, and that can introduce extra alignment padding after the
block.

<rdar://problem/11347135>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-04-30 20:19:00 +00:00
parent e4f1b370bf
commit 887d095fb6
1 changed files with 6 additions and 1 deletions
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7
lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -124,7 +124,12 @@ namespace {
/// This number should be used to predict worst case padding when
/// splitting the block.
unsigned internalKnownBits() const {
return Unalign ? Unalign : KnownBits;
unsigned Bits = Unalign ? Unalign : KnownBits;
// If the block size isn't a multiple of the known bits, assume the
// worst case padding.
if (Size & ((1u << Bits) - 1))
Bits = CountTrailingZeros_32(Size);
return Bits;
}
/// Compute the offset immediately following this block. If LogAlign is