derek.holloway
7502bf64a4
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46 lines
1.2 KiB
YAML
46 lines
1.2 KiB
YAML
# RUN: llc -mtriple=aarch64 -mcpu=apple-m1 -run-pass=early-ifcvt \
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# RUN: -enable-early-ifcvt-data-dependent \
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# RUN: -pass-remarks-analysis='early-ifcvt' -o /dev/null %s 2>&1 | FileCheck %s
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# Test that we emit an analysis remark when the branch condition is data-dependent
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# (derived from a memory load).
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# CHECK: remark: <unknown>:0:0: branch condition is data-dependent (from memory load), using higher CritLimit of {{[0-9]+}} cycles
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--- |
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define i32 @data_dependent_branch(ptr %p, i32 %x, i32 %y) {
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ret i32 0
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}
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...
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---
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name: data_dependent_branch
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alignment: 4
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tracksRegLiveness: true
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liveins:
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- { reg: '$x0', virtual-reg: '%0' }
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- { reg: '$w1', virtual-reg: '%1' }
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- { reg: '$w2', virtual-reg: '%2' }
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body: |
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bb.0:
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successors: %bb.1(0x40000000), %bb.2(0x40000000)
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liveins: $x0, $w1, $w2
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%0:gpr64common = COPY $x0
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%1:gpr32 = COPY $w1
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%2:gpr32 = COPY $w2
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%10:gpr32common = LDRWui %0, 0 :: (load (s32))
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%11:gpr32 = SUBSWri %10, 100, 0, implicit-def $nzcv
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Bcc 12, %bb.2, implicit $nzcv
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B %bb.1
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bb.1:
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successors: %bb.2(0x80000000)
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%20:gpr32 = MADDWrrr %1, %2, $wzr
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bb.2:
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%100:gpr32 = PHI %1, %bb.0, %20, %bb.1
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$w0 = COPY %100
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RET_ReallyLR implicit $w0
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...
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