6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-10 02:36:06 +00:00
Code Issues Projects Releases Wiki Activity

Implement bit-accurate sext instruction.

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
lib/ExecutionEngine/Interpreter/Execution.cpp
View File

@ -1347,21 +1347,25 @@ GenericValue Interpreter::executeSExtInst(Value *SrcVal, const Type *DstTy,
assert(SBitWidth <= 64 && DBitWidth <= 64 && assert(SBitWidth <= 64 && DBitWidth <= 64 &&
"Integer types > 64 bits not supported"); "Integer types > 64 bits not supported");
assert(SBitWidth < DBitWidth && "Invalid sign extend"); assert(SBitWidth < DBitWidth && "Invalid sign extend");
int64_t Extended = 0;
if (SBitWidth == 1) // Normalize to a 64-bit value.
// For sign extension from bool, we must extend the source bits. uint64_t Normalized = 0;
Extended = 0 - (Src.Int1Val & 1); if (SBitWidth <= 8)
else if (SBitWidth <= 8) Normalized = Src.Int8Val;
Extended = (int64_t) (int8_t)Src.Int8Val;
else if (SBitWidth <= 16) else if (SBitWidth <= 16)
Extended = (int64_t) (int16_t)Src.Int16Val; Normalized = Src.Int16Val;
else if (SBitWidth <= 32) else if (SBitWidth <= 32)
Extended = (int64_t) (int32_t)Src.Int32Val; Normalized = Src.Int32Val;
else 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 // 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; return Dest;
} }