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44a7a380aa
folding a load from constant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90545 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
2.5 KiB
LLVM
113 lines
2.5 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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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"
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@g1 = constant {{i32,i8},i32} {{i32,i8} { i32 -559038737, i8 186 }, i32 -889275714 }
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@g2 = constant double 1.0
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@g3 = constant {i64, i64} { i64 123, i64 112312312 }
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; Simple load
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define i32 @test1() {
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%r = load i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0)
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ret i32 %r
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; CHECK: @test1
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; CHECK: ret i32 -559038737
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}
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; PR3152
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; Load of first 16 bits of 32-bit value.
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define i16 @test2() {
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%r = load i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*)
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ret i16 %r
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; CHECK: @test2
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; CHECK: ret i16 -16657
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}
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; Load of second 16 bits of 32-bit value.
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define i16 @test3() {
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%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 1)
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ret i16 %r
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; CHECK: @test3
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; CHECK: ret i16 -8531
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}
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; Load of 8 bit field + tail padding.
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define i16 @test4() {
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%r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 2)
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ret i16 %r
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; CHECK: @test4
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; CHECK: ret i16 186
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}
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; Load of double bits.
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define i64 @test6() {
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%r = load i64* bitcast(double* @g2 to i64*)
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ret i64 %r
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; CHECK: @test6
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; CHECK: ret i64 4607182418800017408
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}
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; Load of double bits.
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define i16 @test7() {
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%r = load i16* bitcast(double* @g2 to i16*)
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ret i16 %r
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; CHECK: @test7
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; CHECK: ret i16 0
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}
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; Double load.
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define double @test8() {
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%r = load double* bitcast({{i32,i8},i32}* @g1 to double*)
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ret double %r
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; CHECK: @test8
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; CHECK: ret double 0xBADEADBEEF
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}
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; i128 load.
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define i128 @test9() {
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%r = load i128* bitcast({i64, i64}* @g3 to i128*)
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ret i128 %r
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; CHECK: @test9
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; CHECK: ret i128 2071796475790618158476296315
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}
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; vector load.
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define <2 x i64> @test10() {
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%r = load <2 x i64>* bitcast({i64, i64}* @g3 to <2 x i64>*)
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ret <2 x i64> %r
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; CHECK: @test10
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; CHECK: ret <2 x i64> <i64 123, i64 112312312>
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}
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; PR5287
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@g4 = internal constant { i8, i8 } { i8 -95, i8 8 }
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define i16 @test11() nounwind {
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entry:
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%a = load i16* bitcast ({ i8, i8 }* @g4 to i16*)
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ret i16 %a
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; CHECK: @test11
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; CHECK: ret i16 2209
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}
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; PR5551
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@test12g = private constant [6 x i8] c"a\00b\00\00\00"
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define i16 @test12() {
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%a = load i16* getelementptr inbounds ([3 x i16]* bitcast ([6 x i8]* @test12g to [3 x i16]*), i32 0, i64 1)
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ret i16 %a
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; CHECK: @test12
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; CHECK: ret i16 98
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}
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