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