derek.holloway
7502bf64a4
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39 lines
1.0 KiB
LLVM
39 lines
1.0 KiB
LLVM
; Test BRCTH.
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; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu -mcpu=z196 \
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; RUN: -no-integrated-as -disable-block-placement | FileCheck %s
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; Test a loop that should be converted into dbr form and then use BRCTH.
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define void @f2(ptr %src, ptr %dest) {
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; CHECK-LABEL: f2:
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; CHECK: blah [[REG:%r[0-5]]]
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; CHECK: [[LABEL:\.[^:]*]]:{{.*}} %loop
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; CHECK: brcth [[REG]], [[LABEL]]
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; CHECK: br %r14
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entry:
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; Force upper bound into a high register in order to encourage the
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; register allocator to use a high register for the count variable.
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%top = call i32 asm sideeffect "blah $0", "=h"()
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br label %loop
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loop:
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%count = phi i32 [ 0, %entry ], [ %next, %loop.next ]
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%next = add i32 %count, 1
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%val = load volatile i32, ptr %src
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%cmp = icmp eq i32 %val, 0
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br i1 %cmp, label %loop.next, label %loop.store
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loop.store:
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%add = add i32 %val, 1
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store volatile i32 %add, ptr %dest
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br label %loop.next
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loop.next:
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%cont = icmp ne i32 %next, %top
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br i1 %cont, label %loop, label %exit
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exit:
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ret void
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}
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