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Matthias Braun
bbad0fa6a9
The code assumed that unclobbered/unspilled callee saved registers are unused in the function. This is not true for callee saved registers that are also used to pass parameters such as swiftself. rdar://33401922 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309350 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
1.5 KiB
YAML
61 lines
1.5 KiB
YAML
# RUN: llc -o - %s -mtriple=arm-- -run-pass prologepilog | FileCheck %s
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--- |
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define swiftcc i8* @need_emergency_slot(i8 *swiftself %v) {
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; Just a dummy to add a swiftself bit. The real code is in the MI below.
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unreachable
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}
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...
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---
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# CHECK-LABEL: name: need_emergency_slot
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# Make sure we do not just assume an unsaved/restored callee saved register
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# is free to use. Callee saved parameters may still be used if they were used
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# to pass arguments (as in swiftself).
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name: need_emergency_slot
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tracksRegLiveness: true
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stack:
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- { id: 0, type: default, size: 8, alignment: 8 }
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- { id: 1, type: default, size: 4096, alignment: 8 }
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body: |
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bb.0:
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liveins: %r10 ; swiftself parameter comes in as %r10
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; Bring up register pressure to force emergency spilling, coax scavenging
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; to use %r10 as that one is not spilled/restored.
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%r0 = IMPLICIT_DEF
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%r1 = IMPLICIT_DEF
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%r2 = IMPLICIT_DEF
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%r3 = IMPLICIT_DEF
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%r4 = IMPLICIT_DEF
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%r5 = IMPLICIT_DEF
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%r6 = IMPLICIT_DEF
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%r7 = IMPLICIT_DEF
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%r8 = IMPLICIT_DEF
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%r9 = IMPLICIT_DEF
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%r11 = IMPLICIT_DEF
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%r12 = IMPLICIT_DEF
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%lr = IMPLICIT_DEF
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; Computing the large stack offset requires an extra register. We should
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; not just use %r10 for that.
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; CHECK-NOT: STRi12 %1,{{.*}}%r10
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STRi12 %r1, %stack.0, 0, 14, _ :: (store 4)
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; use the swiftself parameter value.
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KILL %r10
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KILL %r0
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KILL %r1
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KILL %r2
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KILL %r3
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KILL %r4
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KILL %r5
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KILL %r6
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KILL %r7
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KILL %r8
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KILL %r9
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KILL %r11
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KILL %r12
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KILL %lr
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...
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