forked from OSchip/llvm-project
68 lines
4.3 KiB
YAML
68 lines
4.3 KiB
YAML
# RUN: llc %s -run-pass greedy -o - | FileCheck %s
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# Check that we don't insert spill code for undef values.
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# Uninitialized memory for them is fine.
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# PR33311
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--- |
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; ModuleID = 'stuff.ll'
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target triple = "aarch64--"
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@g = external global i32
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define void @foobar() {
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ret void
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}
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...
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---
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name: foobar
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alignment: 4
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gpr32 }
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- { id: 1, class: gpr32 }
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- { id: 2, class: gpr32all }
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- { id: 3, class: gpr32 }
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- { id: 4, class: gpr64common }
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- { id: 5, class: gpr32 }
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- { id: 6, class: gpr64common }
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- { id: 7, class: gpr32 }
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- { id: 8, class: gpr32 }
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- { id: 9, class: gpr64 }
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body: |
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bb.0:
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liveins: $x0
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successors: %bb.1, %bb.2
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; %8 is going to be spilled.
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; But on that path, we don't care about its value.
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; Emit a simple KILL instruction instead of an
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; actual spill.
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; CHECK: [[UNDEF:%[0-9]+]]:gpr32 = IMPLICIT_DEF
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; CHECK-NEXT: KILL [[UNDEF]]
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%8 = IMPLICIT_DEF
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; %9 us going to be spilled.
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; But it is only partially undef.
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; Make sure we spill it properly
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; CHECK: [[NINE:%[0-9]+]]:gpr64 = COPY $x0
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; CHECK: [[NINE]].sub_32:gpr64 = IMPLICIT_DEF
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; CHECK-NEXT: STRXui [[NINE]]
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%9 = COPY $x0
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%9.sub_32 = IMPLICIT_DEF
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CBNZW $wzr, %bb.2
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B %bb.1
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bb.1:
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%4 = ADRP target-flags(aarch64-page) @g
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%8 = LDRWui %4, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile dereferenceable load 4 from @g)
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INLINEASM &nop, 1, 12, implicit-def dead early-clobber $x0, 12, implicit-def dead early-clobber $x1, 12, implicit-def dead early-clobber $x2, 12, implicit-def dead early-clobber $x3, 12, implicit-def dead early-clobber $x4, 12, implicit-def dead early-clobber $x5, 12, implicit-def dead early-clobber $x6, 12, implicit-def dead early-clobber $x7, 12, implicit-def dead early-clobber $x8, 12, implicit-def dead early-clobber $x9, 12, implicit-def dead early-clobber $x10, 12, implicit-def dead early-clobber $x11, 12, implicit-def dead early-clobber $x12, 12, implicit-def dead early-clobber $x13, 12, implicit-def dead early-clobber $x14, 12, implicit-def dead early-clobber $x15, 12, implicit-def dead early-clobber $x16, 12, implicit-def dead early-clobber $x17, 12, implicit-def dead early-clobber $x18, 12, implicit-def dead early-clobber $x19, 12, implicit-def dead early-clobber $x20, 12, implicit-def dead early-clobber $x21, 12, implicit-def dead early-clobber $x22, 12, implicit-def dead early-clobber $x23, 12, implicit-def dead early-clobber $x24, 12, implicit-def dead early-clobber $x25, 12, implicit-def dead early-clobber $x26, 12, implicit-def dead early-clobber $x27, 12, implicit-def dead early-clobber $x28, 12, implicit-def dead early-clobber $fp, 12, implicit-def dead early-clobber $lr
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bb.2:
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INLINEASM &nop, 1, 12, implicit-def dead early-clobber $x0, 12, implicit-def dead early-clobber $x1, 12, implicit-def dead early-clobber $x2, 12, implicit-def dead early-clobber $x3, 12, implicit-def dead early-clobber $x4, 12, implicit-def dead early-clobber $x5, 12, implicit-def dead early-clobber $x6, 12, implicit-def dead early-clobber $x7, 12, implicit-def dead early-clobber $x8, 12, implicit-def dead early-clobber $x9, 12, implicit-def dead early-clobber $x10, 12, implicit-def dead early-clobber $x11, 12, implicit-def dead early-clobber $x12, 12, implicit-def dead early-clobber $x13, 12, implicit-def dead early-clobber $x14, 12, implicit-def dead early-clobber $x15, 12, implicit-def dead early-clobber $x16, 12, implicit-def dead early-clobber $x17, 12, implicit-def dead early-clobber $x18, 12, implicit-def dead early-clobber $x19, 12, implicit-def dead early-clobber $x20, 12, implicit-def dead early-clobber $x21, 12, implicit-def dead early-clobber $x22, 12, implicit-def dead early-clobber $x23, 12, implicit-def dead early-clobber $x24, 12, implicit-def dead early-clobber $x25, 12, implicit-def dead early-clobber $x26, 12, implicit-def dead early-clobber $x27, 12, implicit-def dead early-clobber $x28, 12, implicit-def dead early-clobber $fp, 12, implicit-def dead early-clobber $lr
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%6 = ADRP target-flags(aarch64-page) @g
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$w0 = MOVi32imm 42
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STRWui %8, %6, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile store 4 into @g)
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STRXui %9, %6, target-flags(aarch64-pageoff, aarch64-nc) @g :: (volatile store 8 into @g)
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RET_ReallyLR implicit killed $w0
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...
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