[llvm-commits] CVS: llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
Reid Spencer
reid at x10sys.com
Sat Jan 20 00:33:08 PST 2007
Changes in directory llvm/lib/ExecutionEngine/Interpreter:
Execution.cpp updated: 1.162 -> 1.163
---
Log message:
Implement bit-accurate sext instruction.
This patch fixes test/Integer/2007-01-17-TruncSext.ll
---
Diffs of the changes: (+14 -10)
Execution.cpp | 24 ++++++++++++++----------
1 files changed, 14 insertions(+), 10 deletions(-)
Index: llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
diff -u llvm/lib/ExecutionEngine/Interpreter/Execution.cpp:1.162 llvm/lib/ExecutionEngine/Interpreter/Execution.cpp:1.163
--- llvm/lib/ExecutionEngine/Interpreter/Execution.cpp:1.162 Wed Jan 17 20:12:51 2007
+++ llvm/lib/ExecutionEngine/Interpreter/Execution.cpp Sat Jan 20 02:32:52 2007
@@ -1347,21 +1347,25 @@
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;
}
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