241 lines
6.6 KiB
LLVM
241 lines
6.6 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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; This test makes sure that these instructions are properly eliminated.
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target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
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@X = constant i32 42 ; <i32*> [#uses=2]
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@X2 = constant i32 47 ; <i32*> [#uses=1]
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@Y = constant [2 x { i32, float }] [ { i32, float } { i32 12, float 1.000000e+00 }, { i32, float } { i32 37, float 0x3FF3B2FEC0000000 } ] ; <[2 x { i32, float }]*> [#uses=2]
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@Z = constant [2 x { i32, float }] zeroinitializer ; <[2 x { i32, float }]*> [#uses=1]
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@GLOBAL = internal constant [4 x i32] zeroinitializer
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; CHECK-LABEL: @test1(
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; CHECK-NOT: load
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define i32 @test1() {
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%B = load i32, i32* @X ; <i32> [#uses=1]
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ret i32 %B
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}
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; CHECK-LABEL: @test2(
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; CHECK-NOT: load
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define float @test2() {
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%A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Y, i64 0, i64 1, i32 1 ; <float*> [#uses=1]
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%B = load float, float* %A ; <float> [#uses=1]
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ret float %B
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}
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; CHECK-LABEL: @test3(
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; CHECK-NOT: load
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define i32 @test3() {
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%A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Y, i64 0, i64 0, i32 0 ; <i32*> [#uses=1]
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%B = load i32, i32* %A ; <i32> [#uses=1]
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ret i32 %B
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}
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; CHECK-LABEL: @test4(
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; CHECK-NOT: load
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define i32 @test4() {
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%A = getelementptr [2 x { i32, float }], [2 x { i32, float }]* @Z, i64 0, i64 1, i32 0 ; <i32*> [#uses=1]
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%B = load i32, i32* %A ; <i32> [#uses=1]
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ret i32 %B
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}
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; CHECK-LABEL: @test5(
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; CHECK-NOT: load
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define i32 @test5(i1 %C) {
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%Y = select i1 %C, i32* @X, i32* @X2 ; <i32*> [#uses=1]
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%Z = load i32, i32* %Y ; <i32> [#uses=1]
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ret i32 %Z
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}
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; CHECK-LABEL: @test7(
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; CHECK-NOT: load
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define i32 @test7(i32 %X) {
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%V = getelementptr i32, i32* null, i32 %X ; <i32*> [#uses=1]
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%R = load i32, i32* %V ; <i32> [#uses=1]
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ret i32 %R
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}
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; CHECK-LABEL: @test8(
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; CHECK-NOT: load
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define i32 @test8(i32* %P) {
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store i32 1, i32* %P
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%X = load i32, i32* %P ; <i32> [#uses=1]
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ret i32 %X
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}
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; CHECK-LABEL: @test9(
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; CHECK-NOT: load
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define i32 @test9(i32* %P) {
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%X = load i32, i32* %P ; <i32> [#uses=1]
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%Y = load i32, i32* %P ; <i32> [#uses=1]
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%Z = sub i32 %X, %Y ; <i32> [#uses=1]
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ret i32 %Z
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}
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; CHECK-LABEL: @test10(
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; CHECK-NOT: load
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define i32 @test10(i1 %C.upgrd.1, i32* %P, i32* %Q) {
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br i1 %C.upgrd.1, label %T, label %F
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T: ; preds = %0
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store i32 1, i32* %Q
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store i32 0, i32* %P
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br label %C
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F: ; preds = %0
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store i32 0, i32* %P
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br label %C
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C: ; preds = %F, %T
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%V = load i32, i32* %P ; <i32> [#uses=1]
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ret i32 %V
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}
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; CHECK-LABEL: @test11(
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; CHECK-NOT: load
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define double @test11(double* %p) {
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%t0 = getelementptr double, double* %p, i32 1
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store double 2.0, double* %t0
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%t1 = getelementptr double, double* %p, i32 1
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%x = load double, double* %t1
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ret double %x
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}
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; CHECK-LABEL: @test12(
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; CHECK-NOT: load
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define i32 @test12(i32* %P) {
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%A = alloca i32
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store i32 123, i32* %A
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; Cast the result of the load not the source
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%Q = bitcast i32* %A to i32*
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%V = load i32, i32* %Q
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ret i32 %V
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}
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; CHECK-LABEL: @test13(
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; CHECK-NOT: load
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define <16 x i8> @test13(<2 x i64> %x) {
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%tmp = load <16 x i8>, <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*)
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ret <16 x i8> %tmp
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}
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define i8 @test14(i8 %x, i32 %y) {
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; This test must not have the store of %x forwarded to the load -- there is an
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; intervening store if %y. However, the intervening store occurs with a different
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; type and size and to a different pointer value. This is ensuring that none of
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; those confuse the analysis into thinking that the second store does not alias
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; the first.
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; CHECK-LABEL: @test14(
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; CHECK: %[[R:.*]] = load i8, i8*
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; CHECK-NEXT: ret i8 %[[R]]
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%a = alloca i32
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%a.i8 = bitcast i32* %a to i8*
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store i8 %x, i8* %a.i8
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store i32 %y, i32* %a
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%r = load i8, i8* %a.i8
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ret i8 %r
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}
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@test15_global = external global i32
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define i8 @test15(i8 %x, i32 %y) {
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; Same test as @test14 essentially, but using a global instead of an alloca.
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; CHECK-LABEL: @test15(
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; CHECK: %[[R:.*]] = load i8, i8*
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; CHECK-NEXT: ret i8 %[[R]]
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%g.i8 = bitcast i32* @test15_global to i8*
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store i8 %x, i8* %g.i8
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store i32 %y, i32* @test15_global
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%r = load i8, i8* %g.i8
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ret i8 %r
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}
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define void @test16(i8* %x, i8* %a, i8* %b, i8* %c) {
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; Check that we canonicalize loads which are only stored to use integer types
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; when there is a valid integer type.
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; CHECK-LABEL: @test16(
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; CHECK: %[[L1:.*]] = load i32, i32*
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; CHECK-NOT: load
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; CHECK: store i32 %[[L1]], i32*
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; CHECK: store i32 %[[L1]], i32*
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; CHECK-NOT: store
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; CHECK: %[[L1:.*]] = load i32, i32*
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; CHECK-NOT: load
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; CHECK: store i32 %[[L1]], i32*
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; CHECK: store i32 %[[L1]], i32*
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; CHECK-NOT: store
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; CHECK: ret
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entry:
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%x.cast = bitcast i8* %x to float*
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%a.cast = bitcast i8* %a to float*
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%b.cast = bitcast i8* %b to float*
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%c.cast = bitcast i8* %c to i32*
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%x1 = load float, float* %x.cast
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store float %x1, float* %a.cast
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store float %x1, float* %b.cast
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%x2 = load float, float* %x.cast
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store float %x2, float* %b.cast
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%x2.cast = bitcast float %x2 to i32
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store i32 %x2.cast, i32* %c.cast
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ret void
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}
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define void @test17(i8** %x, i8 %y) {
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; Check that in cases similar to @test16 we don't try to rewrite a load when
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; its only use is a store but it is used as the pointer to that store rather
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; than the value.
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;
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; CHECK-LABEL: @test17(
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; CHECK: %[[L:.*]] = load i8*, i8**
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; CHECK: store i8 %y, i8* %[[L]]
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entry:
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%x.load = load i8*, i8** %x
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store i8 %y, i8* %x.load
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ret void
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}
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; Check that we don't try change the type of the load by inserting a bitcast
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; generating invalid IR.
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; CHECK-LABEL: @test18(
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; CHECK-NOT: bitcast
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; CHECK: ret
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%swift.error = type opaque
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declare void @useSwiftError(%swift.error** swifterror)
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define void @test18(%swift.error** swifterror %err) {
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entry:
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%swifterror = alloca swifterror %swift.error*, align 8
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store %swift.error* null, %swift.error** %swifterror, align 8
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call void @useSwiftError(%swift.error** nonnull swifterror %swifterror)
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%err.res = load %swift.error*, %swift.error** %swifterror, align 8
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store %swift.error* %err.res, %swift.error** %err, align 8
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ret void
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}
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; Make sure we preseve the type of the store to a swifterror pointer.
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; CHECK-LABEL: @test19(
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; CHECK: [[A:%.*]] = alloca
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; CHECK: call
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; CHECK: [[BC:%.*]] = bitcast i8** [[A]] to
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; CHECK: [[ERRVAL:%.*]] = load {{.*}}[[BC]]
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; CHECK: store {{.*}}[[ERRVAL]]
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; CHECK: ret
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declare void @initi8(i8**)
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define void @test19(%swift.error** swifterror %err) {
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entry:
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%tmp = alloca i8*, align 8
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call void @initi8(i8** %tmp)
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%swifterror = bitcast i8** %tmp to %swift.error**
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%err.res = load %swift.error*, %swift.error** %swifterror, align 8
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store %swift.error* %err.res, %swift.error** %err, align 8
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ret void
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}
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