8aaa368d00
Re-commit after revert in r300668. Changed getMaxFPOffset() to a more conservative heuristic instead of trying to be clever and missing for some exotic calling conventions. We need to reserve an emergency spill slot in cases with large argument types that could overflow immediate offsets for FP relative address calculations. rdar://31317893 Differential Revision: https://reviews.llvm.org/D31643 llvm-svn: 300761
95 lines
2.2 KiB
YAML
95 lines
2.2 KiB
YAML
# RUN: llc -o - %s -mtriple=thumbv7-- -run-pass=stack-protector -run-pass=prologepilog | FileCheck %s
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---
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# This should trigger an emergency spill in the register scavenger because the
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# frame offset into the large argument is too large.
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# CHECK-LABEL: name: func0
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# CHECK: t2STRi12 killed %r7, %sp, 0, 14, _ :: (store 4 into %stack.0)
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# CHECK: %r7 = t2ADDri killed %sp, 4096, 14, _, _
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# CHECK: %r11 = t2LDRi12 killed %r7, 36, 14, _ :: (load 4)
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# CHECK: %r7 = t2LDRi12 %sp, 0, 14, _ :: (load 4 from %stack.0)
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name: func0
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tracksRegLiveness: true
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fixedStack:
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- { id: 0, offset: 4084, size: 4, alignment: 4, isImmutable: true,
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isAliased: false }
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- { id: 1, offset: -12, size: 4096, alignment: 4, isImmutable: false,
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isAliased: false }
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body: |
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bb.0:
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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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%r8 = IMPLICIT_DEF
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%r9 = IMPLICIT_DEF
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%r10 = 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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%r11 = t2LDRi12 %fixed-stack.0, 0, 14, _ :: (load 4)
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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 %r8
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KILL %r9
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KILL %r10
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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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---
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# This should not trigger an emergency spill yet.
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# CHECK-LABEL: name: func1
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# CHECK-NOT: t2STRi12
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# CHECK-NOT: t2ADDri
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# CHECK: %r11 = t2LDRi12 %sp, 4092, 14, _ :: (load 4)
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# CHECK-NOT: t2LDRi12
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name: func1
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tracksRegLiveness: true
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fixedStack:
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- { id: 0, offset: 4044, size: 4, alignment: 4, isImmutable: true,
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isAliased: false }
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- { id: 1, offset: -12, size: 4056, alignment: 4, isImmutable: false,
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isAliased: false }
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body: |
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bb.0:
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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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%r8 = IMPLICIT_DEF
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%r9 = IMPLICIT_DEF
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%r10 = 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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%r11 = t2LDRi12 %fixed-stack.0, 0, 14, _ :: (load 4)
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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 %r8
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KILL %r9
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KILL %r10
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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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