47 lines
1.1 KiB
LLVM
47 lines
1.1 KiB
LLVM
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; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -disable-block-placement -o - %s | FileCheck %s
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; LSR used to pick a sub-optimal solution due to the target responding
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; conservatively to isLegalAddImmediate for negative values.
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declare void @foo(i32)
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define void @test(i32 %px) {
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; CHECK_LABEL: test:
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; CHECK_LABEL: %entry
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; CHECK: subs [[REG0:w[0-9]+]],
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; CHECK: csel {{w[0-9]+}}, wzr, [[REG0]]
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entry:
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%sub = add nsw i32 %px, -1
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%cmp = icmp slt i32 %px, 1
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%.sub = select i1 %cmp, i32 0, i32 %sub
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br label %for.body
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for.body:
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; CHECK_LABEL: %for.body
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; CHECK: cmp
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; CHECK-NEXT: b.eq
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; CHECK-LABEL: %if.then3
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%x.015 = phi i32 [ %inc, %for.inc ], [ %.sub, %entry ]
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%cmp2 = icmp eq i32 %x.015, %px
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br i1 %cmp2, label %for.inc, label %if.then3
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if.then3:
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tail call void @foo(i32 %x.015)
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br label %for.inc
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for.inc:
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; CHECK_LABEL: %for.inc
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; CHECK: cmp
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; CHECK-NEXT: add
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; CHECK-NEXT: b.le
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; CHECK_LABEL: %for.cond.cleanup
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%inc = add nsw i32 %x.015, 1
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%cmp1 = icmp sgt i32 %x.015, %px
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br i1 %cmp1, label %for.cond.cleanup.loopexit, label %for.body
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for.cond.cleanup.loopexit:
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br label %for.cond.cleanup
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for.cond.cleanup:
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ret void
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}
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