116 lines · plain
1# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass register-coalescer -o - %s | FileCheck %s2# Check there is no partial redundent copy left in the loop after register coalescing.3--- |4 ; ModuleID = '<stdin>'5 source_filename = "<stdin>"6 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"7 target triple = "x86_64-unknown-linux-gnu"8 9 @b = common local_unnamed_addr global ptr null, align 810 @a = common local_unnamed_addr global i32 0, align 411 12 define i32 @foo() local_unnamed_addr {13 entry:14 %t0 = load ptr, ptr @b, align 815 %t1 = load i8, ptr %t0, align 116 %cmp4 = icmp eq i8 %t1, 017 %t2 = load i32, ptr @a, align 418 br i1 %cmp4, label %while.end, label %while.body.preheader19 20 while.body.preheader: ; preds = %entry21 br label %while.body22 23 while.body: ; preds = %while.body, %while.body.preheader24 %t3 = phi i32 [ %add3, %while.body ], [ %t2, %while.body.preheader ]25 %t4 = phi i8 [ %t5, %while.body ], [ %t1, %while.body.preheader ]26 %conv = sext i8 %t4 to i3227 %add = mul i32 %t3, 3328 %add3 = add nsw i32 %add, %conv29 store i32 %add3, ptr @a, align 430 %t5 = load i8, ptr %t0, align 131 %cmp = icmp eq i8 %t5, 032 br i1 %cmp, label %while.end, label %while.body33 34 while.end: ; preds = %while.body, %entry35 %.lcssa = phi i32 [ %t2, %entry ], [ %add3, %while.body ]36 ret i32 %.lcssa37 }38 39...40---41# Check A = B and B = A copies will not exist in the loop at the same time.42# CHECK: name: foo43# CHECK: [[L1:bb.3]].{{[a-zA-Z0-9.]+}}:44# CHECK: %[[REGA:.*]] = COPY %[[REGB:.*]]45# CHECK-NOT: %[[REGB]] = COPY %[[REGA]]46# CHECK: JCC_1 %[[L1]], 547 48name: foo49alignment: 1650exposesReturnsTwice: false51legalized: false52regBankSelected: false53selected: false54tracksRegLiveness: true55registers: 56 - { id: 0, class: gr64 }57 - { id: 1, class: gr8 }58 - { id: 2, class: gr32 }59 - { id: 3, class: gr32 }60 - { id: 4, class: gr8 }61 - { id: 5, class: gr32 }62 - { id: 6, class: gr8 }63 - { id: 7, class: gr32 }64 - { id: 8, class: gr32 }65 - { id: 9, class: gr32 }66 - { id: 10, class: gr32 }67 - { id: 11, class: gr32 }68 - { id: 12, class: gr8 }69 - { id: 13, class: gr32 }70frameInfo: 71 isFrameAddressTaken: false72 isReturnAddressTaken: false73 hasStackMap: false74 hasPatchPoint: false75 stackSize: 076 offsetAdjustment: 077 maxAlignment: 078 adjustsStack: false79 hasCalls: false80 maxCallFrameSize: 081 hasOpaqueSPAdjustment: false82 hasVAStart: false83 hasMustTailInVarArgFunc: false84body: |85 bb.0.entry:86 %0 = MOV64rm $rip, 1, $noreg, @b, $noreg :: (dereferenceable load (s64) from @b)87 %12 = MOV8rm %0, 1, $noreg, 0, $noreg :: (load (s8) from %ir.t0)88 TEST8rr %12, %12, implicit-def $eflags89 %11 = MOV32rm $rip, 1, $noreg, @a, $noreg :: (dereferenceable load (s32) from @a)90 JCC_1 %bb.1, 5, implicit killed $eflags91 92 bb.4:93 %10 = COPY %1194 JMP_1 %bb.395 96 bb.1.while.body.preheader:97 98 bb.2.while.body:99 %8 = MOVSX32rr8 %12100 %10 = COPY %11101 %10 = SHL32ri %10, 5, implicit-def dead $eflags102 %10 = ADD32rr %10, %11, implicit-def dead $eflags103 %10 = ADD32rr %10, %8, implicit-def dead $eflags104 MOV32mr $rip, 1, $noreg, @a, $noreg, %10 :: (store (s32) into @a)105 %12 = MOV8rm %0, 1, $noreg, 0, $noreg :: (load (s8) from %ir.t0)106 TEST8rr %12, %12, implicit-def $eflags107 %11 = COPY %10108 JCC_1 %bb.2, 5, implicit killed $eflags109 JMP_1 %bb.3110 111 bb.3.while.end:112 $eax = COPY %10113 RET 0, killed $eax114 115...116