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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/Transforms/LICM/hoisting.ll | |
| parent | 232ab949d5ed04c4ab45c763e0597fc3fc3fa5bc (diff) | |
| download | llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.tar.gz llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.tar.bz2 llvm-2ac6e2354ac9961b00fa351635ed04baf7fdd234.tar.xz | |
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/Transforms/LICM/hoisting.ll')
| -rw-r--r-- | test/Transforms/LICM/hoisting.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/Transforms/LICM/hoisting.ll b/test/Transforms/LICM/hoisting.ll index e7d36afb91..6f28d53af6 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 +} |