64 lines
2.2 KiB
YAML
64 lines
2.2 KiB
YAML
# RUN: llc -mtriple=x86_64-- -run-pass=simple-register-coalescing -run-pass=regallocbasic -run-pass=virtregrewriter -late-remat-update-threshold=0 %s -o - | FileCheck %s
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#
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# PR40061: %t2 = %t1 is rematerialized and %t1 is added into toBeUpdated set
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# to postpone its live interval update. After the rematerialization, the live
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# interval of %t1 is larger than necessary. Then %t1 is merged into %t3 and %t1
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# gets removed. After the merge, %t3 contains live interval larger than
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# necessary. Because %t3 is not in toBeUpdated set so its live interval is not
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# updated after register coalescing, and it will break some assumption in
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# regalloc. This test wants to check the live interval is up-to-date after
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# register coalescing.
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#
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# To prevent the test from taking effect only in assert enabled mode, we want
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# to achieve the test goal without dumping regalloc trace. We add strong hint
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# to allocate both %t1 and %t2 to $rax register. If the %t1's live interval is
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# not shrinked properly after register coalescing, %t1 and %t2 will not be
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# both allocated to $rax because of inference, and we utilize the fact to
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# achieve the test goal. But note that the assumption only holds when we use
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# regallocbasic instead of greedy because greedy can update the live interval
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# in the process of splitting.
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#
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# CHECK-LABEL: name: foo
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# CHECK: bb.0.entry:
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# CHECK: $rax = MOV64ri32 -11
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# CHECK: bb.1:
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# CHECK: $rax = MOV64ri32 -11
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# CHECK: $rax = ADD64ri8 killed renamable $rax, 5
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# CHECK: CMP64ri8 renamable $rax
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# CHECK: RET 0, $rax
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# CHECK: bb.2:
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# CHECK: $rax = ADD64ri8 killed renamable $rax, 10
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# CHECK: bb.3:
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# CHECK: RET 0, $rax
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---
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name: foo
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body: |
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bb.0.entry:
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successors: %bb.1(0x15555555), %bb.2(0x6aaaaaab)
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%t1:gr64 = MOV64ri32 -11
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CMP64ri8 %t1, 1, implicit-def $eflags
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JCC_1 %bb.2, 4, implicit killed $eflags
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JMP_1 %bb.1
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bb.1:
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successors: %bb.1(0x80000000)
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%t2:gr64 = COPY %t1
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%t2:gr64 = ADD64ri8 %t2, 5, implicit-def $eflags
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$rax = COPY %t2
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CMP64ri8 %t2, 1, implicit-def $eflags
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JCC_1 %bb.1, 4, implicit killed $eflags
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RET 0, $rax
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bb.2:
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successors: %bb.3(0x80000000)
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%t3:gr64 = COPY %t1
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%t3:gr64 = ADD64ri8 %t3, 10, implicit-def $eflags
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bb.3:
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$rax = COPY %t3
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RET 0, $rax
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...
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