mirror of
https://github.com/c64scene-ar/llvm-6502.git
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616613d7a4
where it is not available. It's unclear how to get this inserted computation into GVN's scalar availability sets, Owen, help? :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89997 91177308-0d34-0410-b5e6-96231b3b80d8
110 lines
2.1 KiB
LLVM
110 lines
2.1 KiB
LLVM
; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s
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define i32 @test1(i32* %p, i1 %C) {
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; CHECK: @test1
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block1:
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br i1 %C, label %block2, label %block3
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block2:
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br label %block4
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; CHECK: block2:
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; CHECK-NEXT: load i32* %p
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block3:
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store i32 0, i32* %p
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br label %block4
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block4:
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%PRE = load i32* %p
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ret i32 %PRE
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; CHECK: block4:
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; CHECK-NEXT: phi i32
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; CHECK-NEXT: ret i32
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}
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; This is a simple phi translation case.
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define i32 @test2(i32* %p, i32* %q, i1 %C) {
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; CHECK: @test2
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block1:
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br i1 %C, label %block2, label %block3
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block2:
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br label %block4
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; CHECK: block2:
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; CHECK-NEXT: load i32* %q
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block3:
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store i32 0, i32* %p
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br label %block4
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block4:
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%P2 = phi i32* [%p, %block3], [%q, %block2]
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%PRE = load i32* %P2
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ret i32 %PRE
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; CHECK: block4:
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; CHECK-NEXT: phi i32 [
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; CHECK-NOT: load
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; CHECK: ret i32
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}
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; This is a PRE case that requires phi translation through a GEP.
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define i32 @test3(i32* %p, i32* %q, i32** %Hack, i1 %C) {
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; CHECK: @test3
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block1:
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%B = getelementptr i32* %q, i32 1
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store i32* %B, i32** %Hack
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br i1 %C, label %block2, label %block3
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block2:
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br label %block4
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; CHECK: block2:
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; CHECK-NEXT: load i32* %B
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block3:
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%A = getelementptr i32* %p, i32 1
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store i32 0, i32* %A
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br label %block4
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block4:
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%P2 = phi i32* [%p, %block3], [%q, %block2]
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%P3 = getelementptr i32* %P2, i32 1
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%PRE = load i32* %P3
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ret i32 %PRE
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; CHECK: block4:
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; CHECK-NEXT: phi i32 [
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; CHECK-NOT: load
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; CHECK: ret i32
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}
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;; Here the loaded address is available, but the computation is in 'block3'
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;; which does not dominate 'block2'.
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define i32 @test4(i32* %p, i32* %q, i32** %Hack, i1 %C) {
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; CHECK: @test4
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block1:
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br i1 %C, label %block2, label %block3
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block2:
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br label %block4
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; CHECK: block2:
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; CHECK: load i32*
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; CHECK: br label %block4
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block3:
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%B = getelementptr i32* %q, i32 1
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store i32* %B, i32** %Hack
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%A = getelementptr i32* %p, i32 1
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store i32 0, i32* %A
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br label %block4
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block4:
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%P2 = phi i32* [%p, %block3], [%q, %block2]
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%P3 = getelementptr i32* %P2, i32 1
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%PRE = load i32* %P3
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ret i32 %PRE
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; CHECK: block4:
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; CHECK-NEXT: phi i32 [
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; CHECK-NOT: load
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; CHECK: ret i32
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}
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