forked from OSchip/llvm-project
[GreedyRA ORE] Separate Folder Reloads and Zero Cost Folder Reloads
Patchpoint instructions have operands which is actually zero cost (or the same as register) to use the value from the stack. In terms of statistic it makes same to separate them. Move from computation instructions related to stack spill/reload to number of stack slot referenced. Reviewers: reames, MatzeB, anemet, thegameg Reviewed By: reames Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D100016
This commit is contained in:
Serguei Katkov
parent
530456caf9
commit
cf0d3477aa
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@ -551,16 +551,19 @@ private:
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struct RAGreedyStats {
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unsigned Reloads = 0;
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unsigned FoldedReloads = 0;
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unsigned ZeroCostFoldedReloads = 0;
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unsigned Spills = 0;
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unsigned FoldedSpills = 0;
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bool isEmpty() {
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return !(Reloads || FoldedReloads || Spills || FoldedSpills);
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return !(Reloads || FoldedReloads || Spills || FoldedSpills ||
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ZeroCostFoldedReloads);
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}
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void add(RAGreedyStats other) {
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Reloads += other.Reloads;
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FoldedReloads += other.FoldedReloads;
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ZeroCostFoldedReloads += other.ZeroCostFoldedReloads;
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Spills += other.Spills;
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FoldedSpills += other.FoldedSpills;
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}
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@ -3139,6 +3142,9 @@ void RAGreedy::RAGreedyStats::report(MachineOptimizationRemarkMissed &R) {
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R << NV("NumReloads", Reloads) << " reloads ";
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if (FoldedReloads)
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R << NV("NumFoldedReloads", FoldedReloads) << " folded reloads ";
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if (ZeroCostFoldedReloads)
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R << NV("NumZeroCostFoldedReloads", ZeroCostFoldedReloads)
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<< " zero cost folded reloads ";
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}
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RAGreedy::RAGreedyStats
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@ -3151,6 +3157,11 @@ RAGreedy::computeNumberOfSplillsReloads(MachineBasicBlock &MBB) {
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return MFI.isSpillSlotObjectIndex(cast<FixedStackPseudoSourceValue>(
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A->getPseudoValue())->getFrameIndex());
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};
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auto isPatchpointInstr = [](const MachineInstr &MI) {
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return MI.getOpcode() == TargetOpcode::PATCHPOINT ||
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MI.getOpcode() == TargetOpcode::STACKMAP ||
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MI.getOpcode() == TargetOpcode::STATEPOINT;
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};
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for (MachineInstr &MI : MBB) {
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SmallVector<const MachineMemOperand *, 2> Accesses;
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@ -3164,13 +3175,35 @@ RAGreedy::computeNumberOfSplillsReloads(MachineBasicBlock &MBB) {
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}
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if (TII->hasLoadFromStackSlot(MI, Accesses) &&
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llvm::any_of(Accesses, isSpillSlotAccess)) {
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++Stats.FoldedReloads;
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if (!isPatchpointInstr(MI)) {
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Stats.FoldedReloads += Accesses.size();
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continue;
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}
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// For statepoint there may be folded and zero cost folded stack reloads.
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std::pair<unsigned, unsigned> NonZeroCostRange =
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TII->getPatchpointUnfoldableRange(MI);
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SmallSet<unsigned, 16> FoldedReloads;
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SmallSet<unsigned, 16> ZeroCostFoldedReloads;
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for (unsigned Idx = 0, E = MI.getNumOperands(); Idx < E; ++Idx) {
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MachineOperand &MO = MI.getOperand(Idx);
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if (!MO.isFI() || !MFI.isSpillSlotObjectIndex(MO.getIndex()))
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continue;
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if (Idx >= NonZeroCostRange.first && Idx < NonZeroCostRange.second)
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FoldedReloads.insert(MO.getIndex());
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else
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ZeroCostFoldedReloads.insert(MO.getIndex());
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}
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// If stack slot is used in folded reload it is not zero cost then.
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for (unsigned Slot : FoldedReloads)
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ZeroCostFoldedReloads.erase(Slot);
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Stats.FoldedReloads += FoldedReloads.size();
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Stats.ZeroCostFoldedReloads += ZeroCostFoldedReloads.size();
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continue;
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}
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Accesses.clear();
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if (TII->hasStoreToStackSlot(MI, Accesses) &&
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llvm::any_of(Accesses, isSpillSlotAccess)) {
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++Stats.FoldedSpills;
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Stats.FoldedSpills += Accesses.size();
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}
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}
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return Stats;
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@ -1,9 +1,22 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -verify-machineinstrs -O3 -use-registers-for-deopt-values -restrict-statepoint-remat=true < %s 2>&1 | FileCheck %s
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; RUN: llc -verify-machineinstrs -O3 -use-registers-for-deopt-values -restrict-statepoint-remat=true -pass-remarks-filter=regalloc -pass-remarks-output=%t.yaml -stop-after=greedy -o - < %s 2>&1 | FileCheck %s
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; RUN: cat %t.yaml | FileCheck -check-prefix=YAML %s
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK-NOT: error: ran out of registers during register allocation
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;CHECK-NOT: error: ran out of registers during register allocation
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;YAML: --- !Missed
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;YAML: Pass: regalloc
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;YAML: Name: SpillReload
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;YAML: Function: barney
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;YAML: Args:
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;YAML: - NumSpills: '10'
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;YAML: - String: ' spills '
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;YAML: - NumReloads: '7'
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;YAML: - String: ' reloads '
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;YAML: - NumZeroCostFoldedReloads: '20'
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;YAML: - String: ' zero cost folded reloads '
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;YAML: - String: generated in function
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define void @barney(i8 addrspace(1)* %arg, double %arg1, double %arg2, double %arg3, double %arg4, double %arg5, double %arg6, double %arg7, double %arg8, double %arg9, double %arg10, double %arg11, double %arg12) gc "statepoint-example" personality i32* ()* @widget {
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bb:
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@ -46,3 +59,98 @@ declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 , i32 , void ()*,
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declare token @llvm.experimental.gc.statepoint.p0f_i32p1i8f64f64f64f64f64f64f64f64f64f(i64 , i32 , i32 (i8 addrspace(1)*, double, double, double, double, double, double, double, double, double)*, i32 , i32 , ...)
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declare token @llvm.experimental.gc.statepoint.p0f_i32i32p1i8i32f(i64 , i32 , i32 (i32, i8 addrspace(1)*, i32)*, i32 , i32 , ...)
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidp1i8f64f64f64f64f64f64f64f64f64i32f(i64 , i32 , void (i8 addrspace(1)*, double, double, double, double, double, double, double, double, double, i32)*, i32 , i32 , ...)
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;CHECK: body: |
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;CHECK: bb.0.bb:
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;CHECK: successors: %bb.2(0x40000000), %bb.1(0x40000000)
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;CHECK: liveins: $rdi, $xmm0, $xmm1, $xmm2, $xmm3, $xmm4, $xmm5, $xmm6, $xmm7
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;CHECK: %49:fr64 = COPY $xmm7
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;CHECK: %10:fr64 = COPY $xmm6
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;CHECK: %41:fr64 = COPY $xmm5
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;CHECK: %45:fr64 = COPY $xmm4
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;CHECK: %53:fr64 = COPY $xmm3
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;CHECK: %6:fr64 = COPY $xmm2
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;CHECK: %58:fr64 = COPY $xmm1
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;CHECK: %62:fr64 = COPY $xmm0
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;CHECK: %3:gr64 = COPY $rdi
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;CHECK: %76:fr64 = MOVSDrm_alt %fixed-stack.0, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.0)
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;CHECK: %14:fr64 = MOVSDrm_alt %fixed-stack.1, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.1, align 16)
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;CHECK: %66:fr64 = MOVSDrm_alt %fixed-stack.2, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.2)
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;CHECK: %71:fr64 = MOVSDrm_alt %fixed-stack.3, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.3, align 16)
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;CHECK: MOV64mr %stack.0, 1, $noreg, 0, $noreg, %3 :: (store 8 into %stack.0)
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;CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: STATEPOINT 2882400000, 0, 0, target-flags(x86-plt) @blam, 2, 9, 2, 0, 2, 59, 2, 0, 2, 1, 2, 0, 2, 0, 2, 0, 2, 26, 2, 0, 2, 0, 1, 8, %stack.0, 0, 2, 4, %62, 2, 7, 2, 0, 2, 4, %58, 2, 7, 2, 0, 2, 4, %6, 2, 7, 2, 0, 2, 4, %53, 2, 7, 2, 0, 2, 4, %45, 2, 7, 2, 0, 2, 4, %41, 2, 7, 2, 0, 2, 4, %10, 2, 7, 2, 0, 2, 4, %49, 2, 7, 2, 0, 2, 4, %71, 2, 7, 2, 0, 2, 4, %66, 2, 7, 2, 0, 2, 4, %14, 2, 7, 2, 0, 2, 4, %76, 2, 7, 2, 0, 2, 7, 2, 0, 2, 1, 1, 8, %stack.0, 0, 2, 0, 2, 1, 0, 0, csr_64_mostregs, implicit-def $rsp, implicit-def $ssp :: (volatile load store 8 on %stack.0)
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;CHECK: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: %17:gr32 = MOV32r0 implicit-def dead $eflags
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;CHECK: TEST8rr %17.sub_8bit, %17.sub_8bit, implicit-def $eflags
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;CHECK: MOVSDmr %stack.1, 1, $noreg, 0, $noreg, %41 :: (store 8 into %stack.1)
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;CHECK: MOVSDmr %stack.2, 1, $noreg, 0, $noreg, %45 :: (store 8 into %stack.2)
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;CHECK: MOVSDmr %stack.5, 1, $noreg, 0, $noreg, %58 :: (store 8 into %stack.5)
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;CHECK: MOVSDmr %stack.6, 1, $noreg, 0, $noreg, %62 :: (store 8 into %stack.6)
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;CHECK: JCC_1 %bb.2, 4, implicit killed $eflags
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;CHECK: bb.1:
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;CHECK: successors: %bb.3(0x80000000)
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;CHECK: %54:fr64 = MOVSDrm_alt $rip, 1, $noreg, %const.0, $noreg :: (load 8 from constant-pool)
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;CHECK: MOVSDmr %stack.3, 1, $noreg, 0, $noreg, %54 :: (store 8 into %stack.3)
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;CHECK: MOVSDmr %stack.4, 1, $noreg, 0, $noreg, %54 :: (store 8 into %stack.4)
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;CHECK: MOVSDmr %stack.7, 1, $noreg, 0, $noreg, %54 :: (store 8 into %stack.7)
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;CHECK: JMP_1 %bb.3
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;CHECK: bb.2.bb13:
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;CHECK: successors: %bb.3(0x80000000)
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;CHECK: ADJCALLSTACKDOWN64 8, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: MOVSDmr $rsp, 1, $noreg, 0, $noreg, %14 :: (store 8 into stack)
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;CHECK: dead $edi = MOV32r0 implicit-def dead $eflags, implicit-def $rdi
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;CHECK: $xmm0 = COPY %62
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;CHECK: $xmm1 = COPY %58
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;CHECK: $xmm2 = COPY %6
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;CHECK: $xmm3 = COPY %45
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;CHECK: $xmm4 = COPY %41
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;CHECK: $xmm5 = COPY %10
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;CHECK: $xmm6 = COPY %71
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;CHECK: $xmm7 = COPY %66
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;CHECK: MOVSDmr %stack.3, 1, $noreg, 0, $noreg, %49 :: (store 8 into %stack.3)
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;CHECK: MOVSDmr %stack.4, 1, $noreg, 0, $noreg, %53 :: (store 8 into %stack.4)
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;CHECK: MOVSDmr %stack.7, 1, $noreg, 0, $noreg, %76 :: (store 8 into %stack.7)
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;CHECK: STATEPOINT 2, 5, 9, undef %22:gr64, $rdi, $xmm0, $xmm1, $xmm2, $xmm3, $xmm4, $xmm5, $xmm6, $xmm7, 2, 0, 2, 0, 2, 59, 2, 0, 2, 2, 2, 0, 2, 70, 2, 0, 2, 26, 2, 0, 2, 0, 2, 0, 2, 4, 1, 8, %stack.6, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.5, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.4, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.1, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.0, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 1, 2, 0, 2, 0, 2, 1, 0, 0, csr_64, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax :: (load 8 from %stack.1), (load 8 from %stack.2), (load 8 from %stack.3), (load 8 from %stack.4), (load 8 from %stack.5), (load 8 from %stack.6), (load 8 from %fixed-stack.2), (load 8 from %fixed-stack.3, align 16), (load 8 from %fixed-stack.0)
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;CHECK: ADJCALLSTACKUP64 8, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: bb.3.bb15:
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;CHECK: successors: %bb.7(0x7ffff800), %bb.4(0x00000800)
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;CHECK: %24:gr32 = MOV32r0 implicit-def dead $eflags
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;CHECK: TEST8rr %24.sub_8bit, %24.sub_8bit, implicit-def $eflags
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;CHECK: JCC_1 %bb.7, 5, implicit killed $eflags
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;CHECK: JMP_1 %bb.4
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;CHECK: bb.4.bb19:
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;CHECK: successors: %bb.5(0x00000000), %bb.6(0x80000000)
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;CHECK: EH_LABEL <mcsymbol >
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;CHECK: ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: $edx = MOV32r0 implicit-def dead $eflags
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;CHECK: STATEPOINT 1, 16, 3, undef %29:gr64, undef $edi, undef $rsi, $edx, 2, 0, 2, 0, 2, 105, 2, 0, 2, 2, 2, 0, 2, 97, 2, 0, 2, 26, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 0, 2, 2, 2, 3, 2, 0, 2, 20, 2, 0, 2, 0, 2, 4278124286, 2, 4, 1, 8, %stack.6, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.5, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.4, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.1, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.7, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 1, 2, 4278124286, 2, 0, 2, 1, 0, 0, csr_64, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax :: (load 8 from %stack.1), (load 8 from %stack.2), (load 8 from %stack.3), (load 8 from %stack.4), (load 8 from %stack.5), (load 8 from %stack.6), (load 8 from %fixed-stack.2), (load 8 from %fixed-stack.3, align 16), (load 8 from %stack.7)
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;CHECK: ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: EH_LABEL <mcsymbol >
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;CHECK: JMP_1 %bb.5
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;CHECK: bb.5.bb21:
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;CHECK: successors:
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;CHECK: ADJCALLSTACKDOWN64 8, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: %81:fr64 = MOVSDrm_alt %stack.7, 1, $noreg, 0, $noreg :: (load 8 from %stack.7)
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;CHECK: MOVSDmr $rsp, 1, $noreg, 0, $noreg, %81 :: (store 8 into stack)
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;CHECK: $xmm0 = MOVSDrm_alt %stack.6, 1, $noreg, 0, $noreg :: (load 8 from %stack.6)
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;CHECK: $xmm1 = MOVSDrm_alt %stack.5, 1, $noreg, 0, $noreg :: (load 8 from %stack.5)
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;CHECK: $xmm2 = MOVSDrm_alt %stack.4, 1, $noreg, 0, $noreg :: (load 8 from %stack.4)
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;CHECK: $xmm3 = MOVSDrm_alt %stack.2, 1, $noreg, 0, $noreg :: (load 8 from %stack.2)
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;CHECK: $xmm4 = MOVSDrm_alt %stack.1, 1, $noreg, 0, $noreg :: (load 8 from %stack.1)
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;CHECK: $xmm5 = MOVSDrm_alt %stack.3, 1, $noreg, 0, $noreg :: (load 8 from %stack.3)
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;CHECK: %74:fr64 = MOVSDrm_alt %fixed-stack.3, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.3, align 16)
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;CHECK: %95:fr64 = COPY %74
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;CHECK: $xmm6 = COPY %95
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;CHECK: $esi = MOV32ri 51
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;CHECK: %69:fr64 = MOVSDrm_alt %fixed-stack.2, 1, $noreg, 0, $noreg :: (load 8 from %fixed-stack.2)
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;CHECK: %97:fr64 = COPY %69
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;CHECK: $xmm7 = COPY %97
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;CHECK: STATEPOINT 2, 5, 10, undef %36:gr64, undef $rdi, $xmm0, $xmm1, $xmm2, $xmm3, $xmm4, $xmm5, $xmm6, $xmm7, killed $esi, 2, 0, 2, 0, 2, 105, 2, 0, 2, 2, 2, 0, 2, 97, 2, 0, 2, 26, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 7, 2, 0, 2, 2, 2, 2, 2, 46, 2, 0, 2, 20, 2, 0, 2, 0, 2, 4278124286, 2, 4, 1, 8, %stack.6, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.5, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.4, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.1, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.3, 0, 2, 7, 2, 0, 2, 4, 1, 8, %fixed-stack.2, 0, 2, 7, 2, 0, 2, 4, 1, 8, %stack.7, 0, 2, 7, 2, 0, 2, 3, 2, 51, 2, 1, 2, 4278124286, 2, 0, 2, 1, 0, 0, csr_64, implicit-def $rsp, implicit-def $ssp :: (load 8 from %stack.7), (load 8 from %stack.6), (load 8 from %stack.5), (load 8 from %stack.4), (load 8 from %stack.2), (load 8 from %stack.1), (load 8 from %stack.3), (load 8 from %fixed-stack.3, align 16), (load 8 from %fixed-stack.2)
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;CHECK: ADJCALLSTACKUP64 8, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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;CHECK: bb.6.bb23 (landing-pad):
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;CHECK: liveins: $rax, $rdx
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;CHECK: EH_LABEL <mcsymbol >
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;CHECK: RET 0
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;CHECK: bb.7.bb25:
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;CHECK: RET 0
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