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Diffstat (limited to 'test/Transforms/LoadCombine/load-combine-assume.ll')
-rw-r--r-- | test/Transforms/LoadCombine/load-combine-assume.ll | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/test/Transforms/LoadCombine/load-combine-assume.ll b/test/Transforms/LoadCombine/load-combine-assume.ll new file mode 100644 index 0000000..94f6300 --- /dev/null +++ b/test/Transforms/LoadCombine/load-combine-assume.ll @@ -0,0 +1,44 @@ +; RUN: opt -basicaa -load-combine -instcombine -S < %s | FileCheck %s +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +declare void @llvm.assume(i1) nounwind + +; 'load' before the 'call' gets optimized: +define i64 @test1(i32* nocapture readonly %a, i1 %b) { +; CHECK-LABEL: @test1 + +; CHECK-DAG: load i64* %1, align 4 +; CHECK-DAG: tail call void @llvm.assume(i1 %b) +; CHECK: ret i64 + + %load1 = load i32* %a, align 4 + %conv = zext i32 %load1 to i64 + %arrayidx1 = getelementptr inbounds i32* %a, i64 1 + %load2 = load i32* %arrayidx1, align 4 + tail call void @llvm.assume(i1 %b) + %conv2 = zext i32 %load2 to i64 + %shl = shl nuw i64 %conv2, 32 + %add = or i64 %shl, %conv + ret i64 %add +} + +; 'call' before the 'load' doesn't get optimized: +define i64 @test2(i32* nocapture readonly %a, i1 %b) { +; CHECK-LABEL: @test2 + +; CHECK-DAG: load i64* %1, align 4 +; CHECK-DAG: tail call void @llvm.assume(i1 %b) +; CHECK: ret i64 + + %load1 = load i32* %a, align 4 + %conv = zext i32 %load1 to i64 + %arrayidx1 = getelementptr inbounds i32* %a, i64 1 + tail call void @llvm.assume(i1 %b) + %load2 = load i32* %arrayidx1, align 4 + %conv2 = zext i32 %load2 to i64 + %shl = shl nuw i64 %conv2, 32 + %add = or i64 %shl, %conv + ret i64 %add +} + |