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Implement bit-accurate sext instruction.

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This patch fixes test/Integer/2007-01-17-TruncSext.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33394 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-01-20 08:32:52 +00:00
parent 6df4c4576f
commit c00a43092e
1 changed files with 14 additions and 10 deletions
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24
lib/ExecutionEngine/Interpreter/Execution.cpp
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@ -1347,21 +1347,25 @@ GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
assert(SBitWidth <= 64 && DBitWidth <= 64 &&
"Integer types > 64 bits not supported");
assert(SBitWidth < DBitWidth && "Invalid sign extend");
int64_t Extended = 0;
if (SBitWidth == 1)
// For sign extension from bool, we must extend the source bits.
Extended = 0 - (Src.Int1Val & 1);
else if (SBitWidth <= 8)
Extended = (int64_t) (int8_t)Src.Int8Val;
// Normalize to a 64-bit value.
uint64_t Normalized = 0;
if (SBitWidth <= 8)
Normalized = Src.Int8Val;
else if (SBitWidth <= 16)
Extended = (int64_t) (int16_t)Src.Int16Val;
Normalized = Src.Int16Val;
else if (SBitWidth <= 32)
Extended = (int64_t) (int32_t)Src.Int32Val;
Normalized = Src.Int32Val;
else
Extended = (int64_t) Src.Int64Val;
Normalized = Src.Int64Val;
// Now do the bit-accurate sign extension manually.
bool isSigned = (Normalized & (1 << (SBitWidth-1))) != 0;
if (isSigned)
Normalized |= ~SITy->getBitMask();
// Now that we have a sign extended value, assign it to the destination
INTEGER_ASSIGN(Dest, DBitWidth, Extended);
INTEGER_ASSIGN(Dest, DBitWidth, Normalized);
return Dest;
}