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| author | Chris Lattner <sabre@nondot.org> | 2010-08-31 23:00:16 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-08-31 23:00:16 +0000 |
| commit | 2ac6e2354ac9961b00fa351635ed04baf7fdd234 (patch) | |
| tree | de233dd475f72634bcab390c240d82ce7493c4bb /test | |
| parent | 232ab949d5ed04c4ab45c763e0597fc3fc3fa5bc (diff) | |
| download | external_llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.zip external_llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.tar.gz external_llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.tar.bz2 | |
licm is wasting time hoisting constant foldable operations,
instead of hoisting them, just fold them away. This occurs in the
testcase for PR8041, for example.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112669 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/LICM/hoisting.ll | 16 | ||||
| -rw-r--r-- | test/Transforms/LICM/scalar_promote.ll | 12 |
2 files changed, 22 insertions, 6 deletions
diff --git a/test/Transforms/LICM/hoisting.ll b/test/Transforms/LICM/hoisting.ll index e7d36af..6f28d53 100644 --- a/test/Transforms/LICM/hoisting.ll +++ b/test/Transforms/LICM/hoisting.ll @@ -48,3 +48,19 @@ Out: ; preds = %Loop %C = sub i32 %A, %B ; <i32> [#uses=1] ret i32 %C } + + +; This loop invariant instruction should be constant folded, not hoisted. +define i32 @test3(i1 %c) { +; CHECK: define i32 @test3 +; CHECK: call void @foo2(i32 6) + %A = load i32* @X ; <i32> [#uses=2] + br label %Loop +Loop: + %B = add i32 4, 2 ; <i32> [#uses=2] + call void @foo2( i32 %B ) + br i1 %c, label %Loop, label %Out +Out: ; preds = %Loop + %C = sub i32 %A, %B ; <i32> [#uses=1] + ret i32 %C +} diff --git a/test/Transforms/LICM/scalar_promote.ll b/test/Transforms/LICM/scalar_promote.ll index ef28c38..6b103f3 100644 --- a/test/Transforms/LICM/scalar_promote.ll +++ b/test/Transforms/LICM/scalar_promote.ll @@ -1,4 +1,6 @@ ; RUN: opt < %s -licm -S | FileCheck %s +target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" + @X = global i32 7 ; <i32*> [#uses=4] define void @test1(i32 %i) { @@ -32,23 +34,21 @@ Entry: br label %Loop ; CHECK: @test2 ; CHECK: Entry: -; CHECK-NEXT: %X1 = getelementptr i32* @X, i64 0 -; CHECK-NEXT: %X2 = getelementptr i32* @X, i64 0 -; CHECK-NEXT: %X1.promoted = load i32* %X1 +; CHECK-NEXT: %.promoted = load i32* getelementptr inbounds (i32* @X, i64 1) ; CHECK-NEXT: br label %Loop Loop: ; preds = %Loop, %0 - %X1 = getelementptr i32* @X, i64 0 ; <i32*> [#uses=1] + %X1 = getelementptr i32* @X, i64 1 ; <i32*> [#uses=1] %A = load i32* %X1 ; <i32> [#uses=1] %V = add i32 %A, 1 ; <i32> [#uses=1] - %X2 = getelementptr i32* @X, i64 0 ; <i32*> [#uses=1] + %X2 = getelementptr i32* @X, i64 1 ; <i32*> [#uses=1] store i32 %V, i32* %X2 br i1 false, label %Loop, label %Exit Exit: ; preds = %Loop ret void ; CHECK: Exit: -; CHECK-NEXT: store i32 %V, i32* %X1 +; CHECK-NEXT: store i32 %V, i32* getelementptr inbounds (i32* @X, i64 1) ; CHECK-NEXT: ret void } |