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| author | Dale Johannesen <dalej@apple.com> | 2008-12-01 22:00:01 +0000 |
|---|---|---|
| committer | Dale Johannesen <dalej@apple.com> | 2008-12-01 22:00:01 +0000 |
| commit | 589bf0865ccd10d36f406d622c0160be249343e1 (patch) | |
| tree | 20012d23613f326d0c0a9e6e250c69f3e3e50c6c /test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll | |
| parent | c65fc3bd27a84281da9819b5fe89a01535a14ecf (diff) | |
| download | llvm-589bf0865ccd10d36f406d622c0160be249343e1.tar.gz llvm-589bf0865ccd10d36f406d622c0160be249343e1.tar.bz2 llvm-589bf0865ccd10d36f406d622c0160be249343e1.tar.xz | |
Consider only references to an IV within the loop when
figuring out the base of the IV. This produces better
code in the example. (Addresses use (IV) instead of
(BASE,IV) - a significant improvement on low-register
machines like x86).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60374 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll')
| -rw-r--r-- | test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll b/test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll new file mode 100644 index 0000000000..48de967016 --- /dev/null +++ b/test/CodeGen/X86/2008-12-01-loop-iv-used-outside-loop.ll @@ -0,0 +1,28 @@ +; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | grep -v lea +; ModuleID = '<stdin>' +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" +target triple = "i386-apple-darwin9.5" + +define i8* @test(i8* %Q, i32* %L) nounwind { +entry: + br label %bb1 + +bb: ; preds = %bb1, %bb1 + %indvar.next = add i32 %P.0.rec, 1 ; <i32> [#uses=1] + br label %bb1 + +bb1: ; preds = %bb, %entry + %P.0.rec = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; <i32> [#uses=3] + %P.0 = getelementptr i8* %Q, i32 %P.0.rec ; <i8*> [#uses=2] + %0 = load i8* %P.0, align 1 ; <i8> [#uses=1] + switch i8 %0, label %bb3 [ + i8 12, label %bb + i8 42, label %bb + ] + +bb3: ; preds = %bb1 + %P.0.sum = add i32 %P.0.rec, 2 ; <i32> [#uses=1] + %1 = getelementptr i8* %Q, i32 %P.0.sum ; <i8*> [#uses=1] + store i8 4, i8* %1, align 1 + ret i8* %P.0 +} |