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| author | Dan Gohman <gohman@apple.com> | 2010-08-17 22:50:37 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-08-17 22:50:37 +0000 |
| commit | bbc1da8dedf77c0dd3845e09c2d78024d8738646 (patch) | |
| tree | 8eada220302ff521b77fd93e27cc34f010af7678 /test | |
| parent | dc140c6e7b8350ca51aa1d408c10e25a27826e2c (diff) | |
| download | llvm-bbc1da8dedf77c0dd3845e09c2d78024d8738646.tar.gz llvm-bbc1da8dedf77c0dd3845e09c2d78024d8738646.tar.bz2 llvm-bbc1da8dedf77c0dd3845e09c2d78024d8738646.tar.xz | |
Tweak IVUsers' concept of "interesting" to exclude add recurrences
where the step value is an induction variable from an outer loop, to
avoid trouble trying to re-expand such expressions. This effectively
hides such expressions from indvars and lsr, which prevents them
from getting into trouble.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111317 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/licm-nested.ll | 2 | ||||
| -rw-r--r-- | test/CodeGen/X86/lsr-interesting-step.ll | 51 |
2 files changed, 52 insertions, 1 deletions
diff --git a/test/CodeGen/X86/licm-nested.ll b/test/CodeGen/X86/licm-nested.ll index 71685bb5b8..870f687e56 100644 --- a/test/CodeGen/X86/licm-nested.ll +++ b/test/CodeGen/X86/licm-nested.ll @@ -1,4 +1,4 @@ -; RUN: llc -mtriple=x86_64-apple-darwin -march=x86-64 < %s -stats -info-output-file - | grep machine-licm | grep 2 +; RUN: llc -mtriple=x86_64-apple-darwin -march=x86-64 < %s -stats -info-output-file - | grep machine-licm | grep 3 ; MachineLICM should be able to hoist the symbolic addresses out of ; the inner loops. diff --git a/test/CodeGen/X86/lsr-interesting-step.ll b/test/CodeGen/X86/lsr-interesting-step.ll new file mode 100644 index 0000000000..4b7050bd50 --- /dev/null +++ b/test/CodeGen/X86/lsr-interesting-step.ll @@ -0,0 +1,51 @@ +; RUN: llc < %s -march=x86-64 -relocation-model=static -mtriple=x86_64-unknown-linux-gnu + +; The inner loop should require only one add (and no leas either). +; rdar://8100380 + +; CHECK: BB0_4: +; CHECK-NEXT: movb $0, flags(%rdx) +; CHECK-NEXT: addq %rcx, %rdx +; CHECK-NEXT: cmpq $8192, %rdx +; CHECK-NEXT: jl + +@flags = external global [8192 x i8], align 16 ; <[8192 x i8]*> [#uses=1] + +define void @foo() nounwind { +entry: + %tmp = icmp slt i64 2, 8192 ; <i1> [#uses=1] + br i1 %tmp, label %bb, label %bb21 + +bb: ; preds = %entry + br label %bb7 + +bb7: ; preds = %bb, %bb17 + %tmp8 = phi i64 [ %tmp18, %bb17 ], [ 2, %bb ] ; <i64> [#uses=2] + %tmp9 = icmp slt i64 2, 8192 ; <i1> [#uses=1] + br i1 %tmp9, label %bb10, label %bb17 + +bb10: ; preds = %bb7 + br label %bb11 + +bb11: ; preds = %bb10, %bb11 + %tmp12 = phi i64 [ %tmp14, %bb11 ], [ 2, %bb10 ] ; <i64> [#uses=2] + %tmp13 = getelementptr inbounds [8192 x i8]* @flags, i64 0, i64 %tmp12 ; <i8*> [#uses=1] + store i8 0, i8* %tmp13, align 1 + %tmp14 = add nsw i64 %tmp12, %tmp8 ; <i64> [#uses=2] + %tmp15 = icmp slt i64 %tmp14, 8192 ; <i1> [#uses=1] + br i1 %tmp15, label %bb11, label %bb16 + +bb16: ; preds = %bb11 + br label %bb17 + +bb17: ; preds = %bb16, %bb7 + %tmp18 = add nsw i64 %tmp8, 1 ; <i64> [#uses=2] + %tmp19 = icmp slt i64 %tmp18, 8192 ; <i1> [#uses=1] + br i1 %tmp19, label %bb7, label %bb20 + +bb20: ; preds = %bb17 + br label %bb21 + +bb21: ; preds = %bb20, %entry + ret void +} |