derek.holloway
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92 lines
2.2 KiB
YAML
92 lines
2.2 KiB
YAML
# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass=register-coalescer -o - %s
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# An implicit-def will be added to SUBREG_TO_REG during coalescing
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---
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name: rematerialize_subreg_to_reg_added_impdef_0
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1(0x2aaaaaab), %bb.2(0x55555555)
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liveins: $edi
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%0:gr32 = MOV32r0 implicit-def dead $eflags
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%1:gr8 = COPY %0.sub_8bit
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%2:gr64 = SUBREG_TO_REG killed %0, %subreg.sub_32bit
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JCC_1 %bb.2, 5, implicit killed undef $eflags
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bb.1:
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%4:gr8 = COPY %1
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%5:gr8 = COPY killed undef %1
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JMP_1 %bb.5
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bb.2:
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%6:gr64 = IMPLICIT_DEF
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%2:gr64 = COPY killed %6
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%5:gr8 = MOV8ri 1
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bb.5:
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successors: %bb.6(0x30000000), %bb.7(0x50000000)
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TEST8rr killed undef %5, %5, implicit-def $eflags
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JCC_1 %bb.7, 5, implicit killed undef $eflags
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bb.6:
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$al = COPY killed %1
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RET 0, killed undef $al
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bb.7:
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MOV64mr undef $noreg, 1, undef $noreg, 0, undef $noreg, killed %2 :: (store (s64))
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RET 0, killed undef $al
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...
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# Reduced version of previous with the SUBREG_TO_REG already folded
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# away.
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#
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# The mov32r0 defines a subregister and has an implicit-def of the
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# super register. After coalescing, the full register implicit def of
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# %2 becomes a different subregister def.
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---
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name: rematerialize_subreg_to_reg_coalesces_to_subreg_impdef
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1(0x2aaaaaab), %bb.2(0x55555555)
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liveins: $edi
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undef %2.sub_32bit:gr64_with_sub_8bit = MOV32r0 implicit-def dead $eflags, implicit-def %2
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%1:gr8 = COPY %2.sub_8bit
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JCC_1 %bb.2, 5, implicit killed undef $eflags
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bb.1:
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successors: %bb.3(0x80000000)
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dead %3:gr8 = COPY %1
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%4:gr8 = COPY undef %1
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JMP_1 %bb.3
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bb.2:
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successors: %bb.3(0x80000000)
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%5:gr64 = IMPLICIT_DEF
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%2:gr64_with_sub_8bit = COPY %5
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%4:gr8 = MOV8ri 1
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bb.3:
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successors: %bb.4(0x30000000), %bb.5(0x50000000)
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TEST8rr undef %4, %4, implicit-def $eflags
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JCC_1 %bb.5, 5, implicit killed undef $eflags
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bb.4:
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$al = COPY %1
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RET 0, killed undef $al
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bb.5:
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MOV64mr undef $noreg, 1, undef $noreg, 0, undef $noreg, %2 :: (store (s64))
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RET 0, killed undef $al
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...
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