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| author | Bob Wilson <bob.wilson@apple.com> | 2009-11-18 22:52:37 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-11-18 22:52:37 +0000 |
| commit | 60f34b9fb0323688e93cf347d63b56327d6250f8 (patch) | |
| tree | 7e492eb4f7345b2c2cad5fa1fba89b8171d60f71 /test/CodeGen | |
| parent | 79d621035ebe620261dd8139a0882f62edabbfdb (diff) | |
| download | llvm-60f34b9fb0323688e93cf347d63b56327d6250f8.tar.gz llvm-60f34b9fb0323688e93cf347d63b56327d6250f8.tar.bz2 llvm-60f34b9fb0323688e93cf347d63b56327d6250f8.tar.xz | |
Tail duplication still needs to iterate. Duplicating new instructions onto
the tail of a block may make that block a new candidate for duplication.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89264 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/ARM/tail-opts.ll | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/tail-opts.ll b/test/CodeGen/ARM/tail-opts.ll new file mode 100644 index 0000000000..c0651ba6a8 --- /dev/null +++ b/test/CodeGen/ARM/tail-opts.ll @@ -0,0 +1,64 @@ +; RUN: llc < %s -march=arm -mcpu=cortex-a8 -asm-verbose=false | FileCheck %s + +declare void @bar(i32) +declare void @car(i32) +declare void @dar(i32) +declare void @ear(i32) +declare void @far(i32) +declare i1 @qux() + +@GHJK = global i32 0 + +declare i8* @choose(i8*, i8*); + +; BranchFolding should tail-duplicate the indirect jump to avoid +; redundant branching. + +; CHECK: tail_duplicate_me: +; CHECK: qux +; CHECK: qux +; CHECK: ldr r{{.}}, LCPI +; CHECK: str r +; CHECK-NEXT: bx r +; CHECK: ldr r{{.}}, LCPI +; CHECK: str r +; CHECK-NEXT: bx r +; CHECK: ldr r{{.}}, LCPI +; CHECK: str r +; CHECK-NEXT: bx r + +define void @tail_duplicate_me() nounwind { +entry: + %a = call i1 @qux() + %c = call i8* @choose(i8* blockaddress(@tail_duplicate_me, %return), + i8* blockaddress(@tail_duplicate_me, %altret)) + br i1 %a, label %A, label %next +next: + %b = call i1 @qux() + br i1 %b, label %B, label %C + +A: + call void @bar(i32 0) + store i32 0, i32* @GHJK + br label %M + +B: + call void @car(i32 1) + store i32 0, i32* @GHJK + br label %M + +C: + call void @dar(i32 2) + store i32 0, i32* @GHJK + br label %M + +M: + indirectbr i8* %c, [label %return, label %altret] + +return: + call void @ear(i32 1000) + ret void +altret: + call void @far(i32 1001) + ret void +} |