f5c62ee0fa
The insertion point of COPY isn't always optimal and could eventually lead to a worse block layout, see the regression test in the first commit. This change affects many architectures but the amount of total instructions in the test cases seems too be slightly lower.
295 lines
11 KiB
YAML
295 lines
11 KiB
YAML
# RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr9 %s -o - \
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# RUN: -run-pass=livevars,phi-node-elimination | FileCheck %s
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# RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr9 %s -o - \
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# RUN: --passes='require<live-vars>,phi-node-elimination' | FileCheck %s
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--- |
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define void @phi_eliminate(i32 %0, i32 %1, ptr %2) {
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%scevgep3 = getelementptr i8, ptr %2, i64 undef
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call void @llvm.set.loop.iterations.i64(i64 undef)
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br label %4
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4: ; preds = %4, %3
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%5 = phi i32 [ %8, %4 ], [ %0, %3 ]
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%6 = phi ptr [ %scevgep3, %3 ], [ %7, %4 ]
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%7 = getelementptr i8, ptr %6, i64 -1
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%8 = sdiv i32 %5, %1
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%9 = mul nsw i32 %8, %1
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%10 = sub nsw i32 %5, %9
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%11 = icmp ult i32 %10, 10
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%12 = trunc i32 %10 to i8
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%13 = select i1 %11, i8 48, i8 55
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%14 = add i8 %13, %12
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store i8 %14, ptr %7, align 1
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%15 = call i1 @llvm.loop.decrement.i64(i64 1)
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br i1 %15, label %4, label %16
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16: ; preds = %4
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ret void
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}
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declare void @llvm.set.loop.iterations.i64(i64)
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declare i1 @llvm.loop.decrement.i64(i64)
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declare void @llvm.stackprotector(ptr, ptr)
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...
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---
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name: phi_eliminate
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers:
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- { id: 0, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 1, class: gprc, preferred-register: '' }
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- { id: 2, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 3, class: g8rc, preferred-register: '' }
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- { id: 4, class: gprc, preferred-register: '' }
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- { id: 5, class: g8rc, preferred-register: '' }
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- { id: 6, class: g8rc, preferred-register: '' }
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- { id: 7, class: g8rc, preferred-register: '' }
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- { id: 8, class: gprc, preferred-register: '' }
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- { id: 9, class: gprc, preferred-register: '' }
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- { id: 10, class: g8rc, preferred-register: '' }
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- { id: 11, class: gprc, preferred-register: '' }
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- { id: 12, class: gprc, preferred-register: '' }
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- { id: 13, class: crrc, preferred-register: '' }
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- { id: 14, class: gprc_and_gprc_nor0, preferred-register: '' }
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- { id: 15, class: gprc_and_gprc_nor0, preferred-register: '' }
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- { id: 16, class: gprc, preferred-register: '' }
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- { id: 17, class: gprc, preferred-register: '' }
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- { id: 18, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 19, class: gprc, preferred-register: '' }
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- { id: 20, class: gprc, preferred-register: '' }
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- { id: 21, class: gprc, preferred-register: '' }
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- { id: 22, class: crrc, preferred-register: '' }
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- { id: 23, class: gprc, preferred-register: '' }
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- { id: 24, class: gprc, preferred-register: '' }
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- { id: 25, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 26, class: gprc, preferred-register: '' }
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- { id: 27, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 28, class: gprc, preferred-register: '' }
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- { id: 29, class: gprc, preferred-register: '' }
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- { id: 30, class: gprc, preferred-register: '' }
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- { id: 31, class: crrc, preferred-register: '' }
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- { id: 32, class: gprc, preferred-register: '' }
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- { id: 33, class: gprc, preferred-register: '' }
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- { id: 34, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 35, class: gprc, preferred-register: '' }
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- { id: 36, class: gprc, preferred-register: '' }
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- { id: 37, class: gprc, preferred-register: '' }
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- { id: 38, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 39, class: g8rc, preferred-register: '' }
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- { id: 40, class: gprc, preferred-register: '' }
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- { id: 41, class: gprc, preferred-register: '' }
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- { id: 42, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 43, class: gprc, preferred-register: '' }
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- { id: 44, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 45, class: gprc, preferred-register: '' }
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- { id: 46, class: gprc, preferred-register: '' }
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- { id: 47, class: crrc, preferred-register: '' }
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- { id: 48, class: gprc, preferred-register: '' }
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- { id: 49, class: gprc, preferred-register: '' }
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- { id: 50, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 51, class: g8rc, preferred-register: '' }
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- { id: 52, class: gprc, preferred-register: '' }
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- { id: 53, class: gprc, preferred-register: '' }
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- { id: 54, class: g8rc_and_g8rc_nox0, preferred-register: '' }
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- { id: 55, class: gprc, preferred-register: '' }
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- { id: 56, class: gprc, preferred-register: '' }
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liveins:
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- { reg: '$x3', virtual-reg: '%5' }
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- { reg: '$x4', virtual-reg: '%6' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 1
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 4294967295
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack: []
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callSites: []
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constants: []
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machineFunctionInfo: {}
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body: |
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; CHECK-LABEL: name: phi_eliminate
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; CHECK: bb.0 (%ir-block.3):
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: liveins: $x3, $x4
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; CHECK: %6:g8rc = COPY killed $x4
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; CHECK: %5:g8rc = COPY killed $x3
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; CHECK: %9:gprc = COPY killed %6.sub_32
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; CHECK: %8:gprc = COPY killed %5.sub_32
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; CHECK: MTCTR8loop undef %10:g8rc, implicit-def dead $ctr8
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; CHECK: %14:gprc_and_gprc_nor0 = LI 55
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; CHECK: %15:gprc_and_gprc_nor0 = LI 48
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; CHECK: bb.1 (%ir-block.4):
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; CHECK: successors: %bb.2(0x40000000), %bb.7(0x40000000)
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; CHECK: %19:gprc = DIVW %8, %9
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; CHECK: BDNZ8 %bb.2, implicit-def $ctr8, implicit $ctr8
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; CHECK: bb.7:
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; CHECK: successors: %bb.5(0x80000000)
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; CHECK: %61:gprc = COPY killed %8
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; CHECK: %62:g8rc_and_g8rc_nox0 = IMPLICIT_DEF
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; CHECK: %63:gprc = COPY killed %19
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; CHECK: B %bb.5
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; CHECK: bb.2 (%ir-block.4):
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; CHECK: successors: %bb.3(0x40000000), %bb.4(0x40000000)
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; CHECK: %20:gprc = nsw MULLW %19, %9
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; CHECK: %21:gprc = SUBF killed %20, killed %8
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; CHECK: %22:crrc = CMPLWI %21, 10
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; CHECK: %23:gprc = ISEL %15, %14, killed %22.sub_lt
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; CHECK: %24:gprc = ADD4 killed %23, killed %21
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; CHECK: %25:g8rc_and_g8rc_nox0 = STBU killed %24, -1, undef %0:g8rc_and_g8rc_nox0 :: (store (s8) into %ir.7)
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; CHECK: %26:gprc = DIVW %19, %9
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; CHECK: %57:gprc = COPY killed %26
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; CHECK: %58:gprc = COPY %19
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; CHECK: %59:g8rc_and_g8rc_nox0 = COPY killed %25
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; CHECK: %60:gprc = COPY killed %19
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; CHECK: BDZ8 %bb.4, implicit-def $ctr8, implicit $ctr8
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; CHECK: B %bb.3
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; CHECK: bb.3 (%ir-block.4):
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; CHECK: successors: %bb.3(0x7c000000), %bb.4(0x04000000)
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; CHECK: %38:g8rc_and_g8rc_nox0 = COPY killed %59
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; CHECK: %37:gprc = COPY %57
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; CHECK: %36:gprc = COPY killed %58
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; CHECK: %35:gprc = COPY killed %57
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; CHECK: %27:g8rc_and_g8rc_nox0 = COPY killed %38
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; CHECK: %56:gprc = COPY %35
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; CHECK: %28:gprc = DIVW %56, %9
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; CHECK: %29:gprc = nsw MULLW killed %37, %9
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; CHECK: %30:gprc = SUBF killed %29, killed %36
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; CHECK: %31:crrc = CMPLWI %30, 10
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; CHECK: %32:gprc = ISEL %15, %14, killed %31.sub_lt
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; CHECK: %33:gprc = ADD4 killed %32, killed %30
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; CHECK: %34:g8rc_and_g8rc_nox0 = STBU killed %33, -1, killed %27 :: (store unknown-size into %ir.7, align 1)
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; CHECK: %57:gprc = COPY killed %28
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; CHECK: %58:gprc = COPY killed %35
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; CHECK: %59:g8rc_and_g8rc_nox0 = COPY killed %34
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; CHECK: %60:gprc = COPY killed %56
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; CHECK: BDNZ8 %bb.3, implicit-def $ctr8, implicit $ctr8
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; CHECK: B %bb.4
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; CHECK: bb.4:
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; CHECK: successors: %bb.5(0x80000000)
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; CHECK: %44:g8rc_and_g8rc_nox0 = COPY killed %59
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; CHECK: %63:gprc = COPY killed %57
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; CHECK: %61:gprc = COPY killed %60
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; CHECK: %62:g8rc_and_g8rc_nox0 = COPY killed %44
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; CHECK: bb.5:
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; CHECK: successors: %bb.6(0x80000000)
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; CHECK: %55:gprc = COPY killed %63
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; CHECK: %54:g8rc_and_g8rc_nox0 = COPY killed %62
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; CHECK: %53:gprc = COPY killed %61
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; CHECK: %45:gprc = nsw MULLW killed %55, killed %9
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; CHECK: %46:gprc = SUBF killed %45, killed %53
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; CHECK: %47:crrc = CMPLWI %46, 10
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; CHECK: %48:gprc = ISEL killed %15, killed %14, killed %47.sub_lt
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; CHECK: %49:gprc = ADD4 killed %48, killed %46
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; CHECK: dead %50:g8rc_and_g8rc_nox0 = STBU killed %49, -1, killed %54 :: (store unknown-size into %ir.7, align 1)
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; CHECK: B %bb.6
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; CHECK: bb.6 (%ir-block.16):
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; CHECK: BLR8 implicit $lr8, implicit $rm
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bb.0 (%ir-block.3):
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successors: %bb.1(0x80000000)
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liveins: $x3, $x4
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%6:g8rc = COPY killed $x4
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%5:g8rc = COPY killed $x3
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%9:gprc = COPY killed %6.sub_32
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%8:gprc = COPY killed %5.sub_32
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MTCTR8loop undef %10:g8rc, implicit-def dead $ctr8
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%14:gprc_and_gprc_nor0 = LI 55
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%15:gprc_and_gprc_nor0 = LI 48
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bb.1 (%ir-block.4):
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successors: %bb.2(0x40000000), %bb.5(0x40000000)
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%19:gprc = DIVW %8, %9
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BDZ8 %bb.5, implicit-def $ctr8, implicit $ctr8
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B %bb.2
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bb.2 (%ir-block.4):
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successors: %bb.3(0x40000000), %bb.4(0x40000000)
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%20:gprc = nsw MULLW %19, %9
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%21:gprc = SUBF killed %20, killed %8
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%22:crrc = CMPLWI %21, 10
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%23:gprc = ISEL %15, %14, killed %22.sub_lt
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%24:gprc = ADD4 killed %23, killed %21
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%25:g8rc_and_g8rc_nox0 = STBU killed %24, -1, undef %0:g8rc_and_g8rc_nox0 :: (store (s8) into %ir.7)
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%26:gprc = DIVW %19, %9
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BDZ8 %bb.4, implicit-def $ctr8, implicit $ctr8
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B %bb.3
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bb.3 (%ir-block.4):
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successors: %bb.3(0x7c000000), %bb.4(0x04000000)
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%35:gprc = PHI %26, %bb.2, %28, %bb.3
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%36:gprc = PHI %19, %bb.2, %35, %bb.3
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%37:gprc = PHI %26, %bb.2, %28, %bb.3
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%38:g8rc_and_g8rc_nox0 = PHI %25, %bb.2, %34, %bb.3
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%27:g8rc_and_g8rc_nox0 = COPY killed %38
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%56:gprc = COPY %35
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%28:gprc = DIVW %56, %9
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%29:gprc = nsw MULLW killed %37, %9
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%30:gprc = SUBF killed %29, killed %36
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%31:crrc = CMPLWI %30, 10
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%32:gprc = ISEL %15, %14, killed %31.sub_lt
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%33:gprc = ADD4 killed %32, killed %30
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%34:g8rc_and_g8rc_nox0 = STBU killed %33, -1, killed %27 :: (store unknown-size into %ir.7, align 1)
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BDNZ8 %bb.3, implicit-def $ctr8, implicit $ctr8
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B %bb.4
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bb.4:
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successors: %bb.5(0x80000000)
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%41:gprc = PHI %19, %bb.2, %56, %bb.3
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%43:gprc = PHI %26, %bb.2, %28, %bb.3
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%44:g8rc_and_g8rc_nox0 = PHI %25, %bb.2, %34, %bb.3
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%39:g8rc = COPY killed %44
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bb.5:
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successors: %bb.6(0x80000000)
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%53:gprc = PHI %8, %bb.1, %41, %bb.4
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%54:g8rc_and_g8rc_nox0 = PHI undef %0:g8rc_and_g8rc_nox0, %bb.1, %39, %bb.4
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%55:gprc = PHI %19, %bb.1, %43, %bb.4
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%45:gprc = nsw MULLW killed %55, killed %9
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%46:gprc = SUBF killed %45, killed %53
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%47:crrc = CMPLWI %46, 10
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%48:gprc = ISEL killed %15, killed %14, killed %47.sub_lt
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%49:gprc = ADD4 killed %48, killed %46
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dead %50:g8rc_and_g8rc_nox0 = STBU killed %49, -1, killed %54 :: (store unknown-size into %ir.7, align 1)
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B %bb.6
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bb.6 (%ir-block.16):
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BLR8 implicit $lr8, implicit $rm
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...
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