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04ded924f3
The loop optimizers were assuming that scales > 1 were OK. I think this is actually a bug in TargetLoweringBase::isLegalAddressingMode(), since it seems to be trying to reject anything that isn't r+i or r+r, but it has no default case for scales other than 0, 1 or 2. Implementing the hook for z means that z can no longer test any change there though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187497 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
618 B
LLVM
26 lines
618 B
LLVM
; Test loop tuning.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
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; Test that strength reduction is applied to addresses with a scale factor,
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; but that indexed addressing can still be used.
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define void @f1(i32 *%dest, i32 %a) {
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; CHECK-LABEL: f1
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; CHECK-NOT: sllg
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; CHECK: st %r3, 0({{%r[1-5],%r[1-5]}})
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; CHECK: br %r14
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entry:
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br label %loop
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loop:
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%index = phi i64 [ 0, %entry ], [ %next, %loop ]
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%ptr = getelementptr i32 *%dest, i64 %index
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store i32 %a, i32 *%ptr
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%next = add i64 %index, 1
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%cmp = icmp ne i64 %next, 100
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br i1 %cmp, label %loop, label %exit
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exit:
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ret void
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}
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