+; RUN: opt -instcombine -S < %s | FileCheck %s
+
; This test makes sure that these instructions are properly eliminated.
-;
-; RUN: as < %s | opt -instcombine | dis | not grep load
-%X = constant int 42
-%Y = constant [2 x { int, float }] [ { int, float } { int 12, float 1.0 },
- { int, float } { int 37, float 1.2312 } ]
-int %test1() {
- %B = load int* %X
- ret int %B
+@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
}
-float %test2() {
- %A = getelementptr [2 x { int, float}]* %Y, long 0, long 1, ubyte 1
- %B = load float* %A
+; 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
}
-int %test3() {
- %A = getelementptr [2 x { int, float}]* %Y, long 0, long 0, ubyte 0
- %B = load int* %A
- ret int %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
+}