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enhance FoldReinterpretLoadFromConstPtr to handle loads of up to 32

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bytes (i256).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84941 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-10-23 06:50:36 +00:00
parent fe8c7c807c
commit 739208a790
2 changed files with 19 additions and 6 deletions
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14
lib/Analysis/ConstantFolding.cpp
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@ -232,7 +232,7 @@ static Constant *FoldReinterpretLoadFromConstPtr(Constant *C,
}
unsigned BytesLoaded = (IntType->getBitWidth() + 7) / 8;
if (BytesLoaded > 8 || BytesLoaded == 0) return 0;
if (BytesLoaded > 32 || BytesLoaded == 0) return 0;
GlobalValue *GVal;
int64_t Offset;
@ -253,16 +253,18 @@ static Constant *FoldReinterpretLoadFromConstPtr(Constant *C,
if (uint64_t(Offset) >= TD.getTypeAllocSize(GV->getInitializer()->getType()))
return UndefValue::get(IntType);
unsigned char RawBytes[8] = {0};
unsigned char RawBytes[32] = {0};
if (!ReadDataFromGlobal(GV->getInitializer(), Offset, RawBytes,
BytesLoaded, TD))
return 0;
uint64_t ResultVal = 0;
for (unsigned i = 0; i != BytesLoaded; ++i)
ResultVal |= (uint64_t)RawBytes[i] << (i * 8);
APInt ResultVal(IntType->getBitWidth(), 0);
for (unsigned i = 0; i != BytesLoaded; ++i) {
ResultVal <<= 8;
ResultVal |= APInt(IntType->getBitWidth(), RawBytes[BytesLoaded-1-i]);
}
return ConstantInt::get(IntType, ResultVal);
return ConstantInt::get(IntType->getContext(), ResultVal);
}
/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would

11
test/Transforms/ConstProp/loads.ll
View File

@ -4,6 +4,7 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
@test1 = constant {{i32,i8},i32} {{i32,i8} { i32 -559038737, i8 186 }, i32 -889275714 }
@test2 = constant double 1.0
@test3 = constant {i64, i64} { i64 123, i64 112312312 }
; Simple load
define i32 @test1() {
@ -66,3 +67,13 @@ define double @test8() {
; @test8
; CHECK: ret double 0xDEADBEBA
}
; i128 load.
define i128 @test9() {
%r = load i128* bitcast({i64, i64}* @test3 to i128*)
ret i128 %r
; @test9
; CHECK: ret i128 112312312
}