derek.holloway
7502bf64a4
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120 lines
2.6 KiB
LLVM
120 lines
2.6 KiB
LLVM
; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<target-ir>,require<scalar-evolution>,require<opt-remark-emit>,loop-mssa(licm)' < %s -S | FileCheck %s
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declare i32 @foo() readonly argmemonly nounwind
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declare i32 @foo2() readonly nounwind
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declare i32 @bar(ptr %loc2) readonly argmemonly nounwind
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define void @test(ptr %loc) {
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; CHECK-LABEL: @test
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; CHECK: @foo
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; CHECK-LABEL: loop:
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br label %loop
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loop:
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%res = call i32 @foo()
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store i32 %res, ptr %loc
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br label %loop
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}
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; Negative test: show argmemonly is required
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define void @test_neg(ptr %loc) {
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; CHECK-LABEL: @test_neg
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; CHECK-LABEL: loop:
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; CHECK: @foo
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br label %loop
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loop:
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%res = call i32 @foo2()
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store i32 %res, ptr %loc
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br label %loop
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}
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define void @test2(ptr noalias %loc, ptr noalias %loc2) {
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; CHECK-LABEL: @test2
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; CHECK: @bar
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; CHECK-LABEL: loop:
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br label %loop
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loop:
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%res = call i32 @bar(ptr %loc2)
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store i32 %res, ptr %loc
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br label %loop
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}
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; Negative test: %might clobber gep
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define void @test3(ptr %loc) {
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; CHECK-LABEL: @test3
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; CHECK-LABEL: loop:
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; CHECK: @bar
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br label %loop
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loop:
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%res = call i32 @bar(ptr %loc)
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%gep = getelementptr i32, ptr %loc, i64 1000000
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store i32 %res, ptr %gep
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br label %loop
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}
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; Negative test: %loc might alias %loc2
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define void @test4(ptr %loc, ptr %loc2) {
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; CHECK-LABEL: @test4
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; CHECK-LABEL: loop:
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; CHECK: @bar
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br label %loop
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loop:
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%res = call i32 @bar(ptr %loc2)
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store i32 %res, ptr %loc
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br label %loop
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}
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declare i32 @foo_new(ptr) readonly
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define void @test5(ptr %loc2, ptr noalias %loc) {
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; CHECK-LABEL: @test5
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; CHECK: @bar
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; CHECK-LABEL: loop:
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br label %loop
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loop:
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%res1 = call i32 @bar(ptr %loc2)
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%res = call i32 @foo_new(ptr %loc2)
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store volatile i32 %res1, ptr %loc
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br label %loop
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}
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; memcpy doesn't write to it's source argument, so loads to that location
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; can still be hoisted
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define void @test6(ptr noalias %loc, ptr noalias %loc2) {
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; CHECK-LABEL: @test6
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; CHECK: %val = load i32, ptr %loc2
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; CHECK-LABEL: loop:
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; CHECK: @llvm.memcpy
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br label %loop
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loop:
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%val = load i32, ptr %loc2
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store i32 %val, ptr %loc
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call void @llvm.memcpy.p0.p0.i64(ptr %loc, ptr %loc2, i64 8, i1 false)
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br label %loop
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}
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define void @test7(ptr noalias %loc, ptr noalias %loc2) {
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; CHECK-LABEL: @test7
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; CHECK: %val = load i32, ptr %loc2
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; CHECK-LABEL: loop:
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; CHECK: @custom_memcpy
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br label %loop
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loop:
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%val = load i32, ptr %loc2
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store i32 %val, ptr %loc
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call void @custom_memcpy(ptr %loc, ptr %loc2)
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br label %loop
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}
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1)
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declare void @custom_memcpy(ptr nocapture writeonly, ptr nocapture readonly) argmemonly nounwind
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