llvm-project/llvm/test/CodeGen/AArch64/GlobalISel/select-phi.mir

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# RUN: llc -mtriple=aarch64-unknown-unknown -o - -global-isel -verify-machineinstrs -run-pass=instruction-select %s | FileCheck %s
--- |
; ModuleID = '/tmp/test.ll'
source_filename = "/tmp/test.ll"
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-unknown"
define i32 @test_phi(i32 %argc) {
entry:
%cmp = icmp ugt i32 %argc, 0
br i1 %cmp, label %case1, label %case2
case1: ; preds = %entry
%tmp1 = add i32 %argc, 1
br label %return
case2: ; preds = %entry
%tmp2 = add i32 %argc, 2
br label %return
return: ; preds = %case2, %case1
%res = phi i32 [ %tmp1, %case1 ], [ %tmp2, %case2 ]
ret i32 %res
}
...
---
name: test_phi
alignment: 2
exposesReturnsTwice: false
legalized: true
regBankSelected: true
selected: false
tracksRegLiveness: true
registers:
- { id: 0, class: gpr, preferred-register: '' }
- { id: 1, class: gpr, preferred-register: '' }
- { id: 2, class: gpr, preferred-register: '' }
- { id: 3, class: gpr, preferred-register: '' }
- { id: 4, class: gpr, preferred-register: '' }
- { id: 5, class: gpr, preferred-register: '' }
- { id: 6, class: gpr, preferred-register: '' }
- { id: 7, class: gpr, preferred-register: '' }
- { id: 8, class: gpr, preferred-register: '' }
liveins:
body: |
bb.1.entry:
successors: %bb.2.case1(0x40000000), %bb.3.case2(0x40000000)
liveins: %w0
; CHECK-LABEL: name: test_phi
; CHECK: [[RES:%.*]] = PHI
%0(s32) = COPY %w0
%1(s32) = G_CONSTANT i32 0
%3(s32) = G_CONSTANT i32 1
%5(s32) = G_CONSTANT i32 2
%8(s32) = G_ICMP intpred(ugt), %0(s32), %1
%2(s1) = G_TRUNC %8(s32)
G_BRCOND %2(s1), %bb.2.case1
G_BR %bb.3.case2
bb.2.case1:
successors: %bb.4.return(0x80000000)
%4(s32) = G_ADD %0, %3
G_BR %bb.4.return
bb.3.case2:
successors: %bb.4.return(0x80000000)
%6(s32) = G_ADD %0, %5
bb.4.return:
%7(s32) = G_PHI %4(s32), %bb.2.case1, %6(s32), %bb.3.case2
%w0 = COPY %7(s32)
RET_ReallyLR implicit %w0
...