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