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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -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: // %bb.0: // %entry
; CHECK-NEXT: str x30, [sp, #-32]! // 8-byte Folded Spill
; CHECK-NEXT: stp x20, x19, [sp, #16] // 16-byte Folded Spill
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: .cfi_offset w19, -8
; CHECK-NEXT: .cfi_offset w20, -16
; CHECK-NEXT: .cfi_offset w30, -32
; CHECK-NEXT: subs w8, w0, #1
; CHECK-NEXT: mov w19, w0
; CHECK-NEXT: csel w20, wzr, w8, lt
; CHECK-NEXT: b .LBB0_2
; CHECK-NEXT: .LBB0_1: // %for.inc
; CHECK-NEXT: // in Loop: Header=BB0_2 Depth=1
; CHECK-NEXT: cmp w20, w19
; CHECK-NEXT: add w20, w20, #1
; CHECK-NEXT: b.gt .LBB0_4
; CHECK-NEXT: .LBB0_2: // %for.body
; CHECK-NEXT: // =>This Inner Loop Header: Depth=1
; CHECK-NEXT: cmp w19, w20
; CHECK-NEXT: b.eq .LBB0_1
; CHECK-NEXT: // %bb.3: // %if.then3
; CHECK-NEXT: // in Loop: Header=BB0_2 Depth=1
; CHECK-NEXT: mov w0, w20
; CHECK-NEXT: bl foo
; CHECK-NEXT: b .LBB0_1
; CHECK-NEXT: .LBB0_4: // %for.cond.cleanup
; CHECK-NEXT: ldp x20, x19, [sp, #16] // 16-byte Folded Reload
; CHECK-NEXT: ldr x30, [sp], #32 // 8-byte Folded Reload
; CHECK-NEXT: ret
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:
%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:
%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
}
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