forked from OSchip/llvm-project
152 lines
3.9 KiB
YAML
152 lines
3.9 KiB
YAML
# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass x86-fixup-bw-insts %s -o - | FileCheck %s
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--- |
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define void @test1() { ret void }
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define void @test2() { ret void }
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define i16 @test3(i16* readonly %p) {
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; Keep original IR to show how the situation like this might happen
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; due to preceding CG passes.
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;
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; %0 is used in %if.end BB (before tail-duplication), so its
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; corresponding super-register (EAX) is live-in into that BB (%if.end)
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; and also has an implicit-def EAX flag. Make sure that we still change
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; the movw into movzwl because EAX is not live before the load (which
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; can be seen by the fact that implicit EAX flag is missing).
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entry:
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%tobool = icmp eq i16* %p, null
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br i1 %tobool, label %if.end, label %if.then
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if.then: ; preds = %entry
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%0 = load i16, i16* %p, align 2
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br label %if.end
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if.end: ; preds = %if.then, %entry
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%i.0 = phi i16 [ %0, %if.then ], [ 0, %entry ]
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ret i16 %i.0
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}
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...
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---
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# CHECK-LABEL: name: test1
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name: test1
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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tracksRegLiveness: true
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registers:
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liveins:
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- { reg: '%rax' }
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frameInfo:
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stackSize: 0
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fixedStack:
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stack:
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constants:
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# Verify that "movw (%rax), %ax" is changed to "movzwl (%rax), %rax".
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#
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# For that to happen, the liveness information after the MOV16rm
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# instruction should be used, not before it because %rax is live
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# before the MOV and is killed by it.
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body: |
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bb.0:
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liveins: %rax
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%ax = MOV16rm killed %rax, 1, %noreg, 0, %noreg
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; CHECK: %eax = MOVZX32rm16 killed %rax
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RETQ %ax
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...
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---
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# CHECK-LABEL: name: test2
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name: test2
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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tracksRegLiveness: true
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registers:
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liveins:
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- { reg: '%rax' }
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frameInfo:
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stackSize: 0
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fixedStack:
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stack:
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constants:
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# Imp-use of any super-register means the register is live before the MOV
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body: |
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bb.0:
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liveins: %dl, %rbx, %rcx, %r14
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%cl = MOV8rr killed %dl, implicit killed %rcx, implicit-def %rcx
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; CHECK: %cl = MOV8rr killed %dl, implicit killed %rcx, implicit-def %rcx
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JMP_1 %bb.1
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bb.1:
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liveins: %rcx
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RETQ %cl
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...
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---
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# CHECK-LABEL: name: test3
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name: test3
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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tracksRegLiveness: true
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registers:
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liveins:
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- { reg: '%rdi', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 0
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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savePoint: ''
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restorePoint: ''
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fixedStack:
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stack:
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constants:
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# After MOV16rm the whole %eax is not *really* live, as can be seen by
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# missing implicit-uses of it in that MOV. Make sure that MOV is
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# transformed into MOVZX.
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# See the comment near the original IR on what preceding decisions can
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# lead to that.
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body: |
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bb.0.entry:
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successors: %bb.1(0x30000000), %bb.2.if.then(0x50000000)
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liveins: %rdi
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TEST64rr %rdi, %rdi, implicit-def %eflags
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JE_1 %bb.1, implicit %eflags
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bb.2.if.then:
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liveins: %rdi
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%ax = MOV16rm killed %rdi, 1, %noreg, 0, %noreg, implicit-def %eax :: (load 2 from %ir.p)
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; CHECK: %eax = MOVZX32rm16 killed %rdi, 1, %noreg, 0, %noreg, implicit-def %eax :: (load 2 from %ir.p)
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%ax = KILL %ax, implicit killed %eax
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RETQ %ax
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bb.1:
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%eax = XOR32rr undef %eax, undef %eax, implicit-def dead %eflags
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%ax = KILL %ax, implicit killed %eax
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RETQ %ax
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...
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