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fix PR5287, a serious regression from my previous patches. Thanks to

Browse Source 
Duncan for the nice tiny testcase.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-10-24 05:22:15 +00:00
parent 66284e063a
commit c5af649758
2 changed files with 39 additions and 24 deletions
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1
lib/Analysis/ConstantFolding.cpp
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@ -161,6 +161,7 @@ static bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset,
return true;
// Move to the next element of the struct.
CurPtr += NextEltOffset-CurEltOffset-ByteOffset;
BytesLeft -= NextEltOffset-CurEltOffset-ByteOffset;
ByteOffset = 0;
CurEltOffset = NextEltOffset;

62
test/Transforms/ConstProp/loads.ll
View File

@ -2,88 +2,102 @@
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
@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 }
@g1 = constant {{i32,i8},i32} {{i32,i8} { i32 -559038737, i8 186 }, i32 -889275714 }
@g2 = constant double 1.0
@g3 = constant {i64, i64} { i64 123, i64 112312312 }
; Simple load
define i32 @test1() {
%r = load i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0)
%r = load i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0)
ret i32 %r
; @test1
; CHECK: @test1
; CHECK: ret i32 -559038737
}
; PR3152
; Load of first 16 bits of 32-bit value.
define i16 @test2() {
%r = load i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*)
%r = load i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*)
ret i16 %r
; @test2
; CHECK: @test2
; CHECK: ret i16 -16657
}
; Load of second 16 bits of 32-bit value.
define i16 @test3() {
%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*), i32 1)
%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 1)
ret i16 %r
; @test3
; CHECK: @test3
; CHECK: ret i16 -8531
}
; Load of 8 bit field + tail padding.
define i16 @test4() {
%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @test1, i32 0, i32 0, i32 0) to i16*), i32 2)
%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 2)
ret i16 %r
; @test4
; CHECK: @test4
; CHECK: ret i16 186
}
; Load of double bits.
define i64 @test6() {
%r = load i64* bitcast(double* @test2 to i64*)
%r = load i64* bitcast(double* @g2 to i64*)
ret i64 %r
; @test6
; CHECK: @test6
; CHECK: ret i64 4607182418800017408
}
; Load of double bits.
define i16 @test7() {
%r = load i16* bitcast(double* @test2 to i16*)
%r = load i16* bitcast(double* @g2 to i16*)
ret i16 %r
; @test7
; CHECK: @test7
; CHECK: ret i16 0
}
; Double load.
define double @test8() {
%r = load double* bitcast({{i32,i8},i32}* @test1 to double*)
%r = load double* bitcast({{i32,i8},i32}* @g1 to double*)
ret double %r
; @test8
; CHECK: ret double 0xDEADBEBA
; CHECK: @test8
; CHECK: ret double 0xBADEADBEEF
}
; i128 load.
define i128 @test9() {
%r = load i128* bitcast({i64, i64}* @test3 to i128*)
%r = load i128* bitcast({i64, i64}* @g3 to i128*)
ret i128 %r
; @test9
; CHECK: ret i128 112312312
; CHECK: @test9
; CHECK: ret i128 2071796475790618158476296315
}
; vector load.
define <2 x i64> @test10() {
%r = load <2 x i64>* bitcast({i64, i64}* @test3 to <2 x i64>*)
%r = load <2 x i64>* bitcast({i64, i64}* @g3 to <2 x i64>*)
ret <2 x i64> %r
; @test10
; CHECK: ret <2 x i64> <i64 112312312, i64 0>
; CHECK: @test10
; CHECK: ret <2 x i64> <i64 123, i64 112312312>
}
; PR5287
@g4 = internal constant { i8, i8 } { i8 -95, i8 8 }
define i16 @test11() nounwind {
entry:
%a = load i16* bitcast ({ i8, i8 }* @g4 to i16*)
ret i16 %a
; CHECK: @test11
; CHECK: ret i16 2209
}