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| author | Gabor Greif <ggreif@gmail.com> | 2010-09-14 08:50:43 +0000 |
|---|---|---|
| committer | Gabor Greif <ggreif@gmail.com> | 2010-09-14 08:50:43 +0000 |
| commit | 4e05b325090eace73bfb551ea49b6fe9d74fc91e (patch) | |
| tree | 1ab7bd961eca7e23d20a5515501e61a9d9088ab4 /test | |
| parent | 23da0b23a3f01d9a46e54a4ba6fc6e4b42eda7c1 (diff) | |
| download | llvm-4e05b325090eace73bfb551ea49b6fe9d74fc91e.tar.gz llvm-4e05b325090eace73bfb551ea49b6fe9d74fc91e.tar.bz2 llvm-4e05b325090eace73bfb551ea49b6fe9d74fc91e.tar.xz | |
test for and-tst peephole optimization
documents the status-quo with its opportunities
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113838 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/ARM/arm-and-tst-peephole.ll | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/arm-and-tst-peephole.ll b/test/CodeGen/ARM/arm-and-tst-peephole.ll new file mode 100644 index 0000000000..77bc9eec1a --- /dev/null +++ b/test/CodeGen/ARM/arm-and-tst-peephole.ll @@ -0,0 +1,58 @@ +; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s +; RUN: llc < %s -mtriple=thumbv6-apple-darwin | FileCheck -check-prefix=T2 %s + +%struct.Foo = type { i8* } + +define %struct.Foo* @_ZN3Foo7collectEj(%struct.Foo* %this, i32 %acc) nounwind readonly align 2 { +entry: + %scevgep = getelementptr %struct.Foo* %this, i32 1 + br label %tailrecurse + +tailrecurse: ; preds = %sw.bb, %entry + %lsr.iv2 = phi %struct.Foo* [ %scevgep3, %sw.bb ], [ %scevgep, %entry ] + %lsr.iv = phi i32 [ %lsr.iv.next, %sw.bb ], [ 1, %entry ] + %acc.tr = phi i32 [ %or, %sw.bb ], [ %acc, %entry ] + %lsr.iv24 = bitcast %struct.Foo* %lsr.iv2 to i8** + %scevgep5 = getelementptr i8** %lsr.iv24, i32 -1 + %tmp2 = load i8** %scevgep5 + %0 = ptrtoint i8* %tmp2 to i32 + +; CHECK: and lr, r12, #3 +; CHECK-NEXT: tst r12, #3 +; CHECK-NEXT: beq LBB0_4 + +; T2: movs r5, #3 +; T2-NEXT: mov r6, r4 +; T2-NEXT: ands r6, r5 +; T2-NEXT: tst r4, r5 +; T2-NEXT: beq LBB0_5 + + %and = and i32 %0, 3 + %tst = icmp eq i32 %and, 0 + br i1 %tst, label %sw.bb, label %tailrecurse.switch + +tailrecurse.switch: ; preds = %tailrecurse + switch i32 %and, label %sw.epilog [ + i32 1, label %sw.bb + i32 3, label %sw.bb6 + i32 2, label %sw.bb8 + ] + +sw.bb: ; preds = %tailrecurse.switch, %tailrecurse + %shl = shl i32 %acc.tr, 1 + %or = or i32 %and, %shl + %lsr.iv.next = add i32 %lsr.iv, 1 + %scevgep3 = getelementptr %struct.Foo* %lsr.iv2, i32 1 + br label %tailrecurse + +sw.bb6: ; preds = %tailrecurse.switch + ret %struct.Foo* %lsr.iv2 + +sw.bb8: ; preds = %tailrecurse.switch + %tmp1 = add i32 %acc.tr, %lsr.iv + %add.ptr11 = getelementptr inbounds %struct.Foo* %this, i32 %tmp1 + ret %struct.Foo* %add.ptr11 + +sw.epilog: ; preds = %tailrecurse.switch + ret %struct.Foo* undef +} |