diff options
Diffstat (limited to 'test/Transforms/InstCombine/load.ll')
| -rw-r--r-- | test/Transforms/InstCombine/load.ll | 76 |
1 files changed, 65 insertions, 11 deletions
diff --git a/test/Transforms/InstCombine/load.ll b/test/Transforms/InstCombine/load.ll index d11e08e..b4b7558 100644 --- a/test/Transforms/InstCombine/load.ll +++ b/test/Transforms/InstCombine/load.ll @@ -1,6 +1,8 @@ +; RUN: opt -instcombine -S < %s | FileCheck %s + ; This test makes sure that these instructions are properly eliminated. -; -; RUN: opt < %s -instcombine -S | not grep load + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" @X = constant i32 42 ; <i32*> [#uses=2] @X2 = constant i32 47 ; <i32*> [#uses=1] @@ -10,47 +12,63 @@ @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] @@ -58,6 +76,8 @@ define i32 @test9(i32* %P) { 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 @@ -72,6 +92,8 @@ C: ; preds = %F, %T 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 @@ -80,19 +102,51 @@ define double @test11(double* %p) { 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 + %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) { -entry: - %tmp = load <16 x i8> * bitcast ([4 x i32]* @GLOBAL to <16 x i8>*) - ret <16 x i8> %tmp + %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 +} |