mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-31 12:41:49 +01:00
[BranchFolding] Fix live-in's when hoisting code
Summary: When the branch folder hoist code into a predecessor it adjust live-in's in the blocks it hoist code from. However it fail to handle hoisted code that contain a defed register that originally is live-in in the block through a super register. This is fixed by replacing the live-in handling code with calls to utility functions in LivePhysRegs. Reviewers: kparzysz, gberry, MatzeB, uweigand, aprantl Reviewed By: kparzysz Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D47529 llvm-svn: 334163
This commit is contained in:
Karl-Johan Karlsson
parent
6e843177d7
commit
bee8ac1f16
@ -185,6 +185,13 @@ void addLiveIns(MachineBasicBlock &MBB, const LivePhysRegs &LiveRegs);
|
||||
void computeAndAddLiveIns(LivePhysRegs &LiveRegs,
|
||||
MachineBasicBlock &MBB);
|
||||
|
||||
/// Convenience function for recomputing live-in's for \p MBB.
|
||||
static inline void recomputeLiveIns(MachineBasicBlock &MBB) {
|
||||
LivePhysRegs LPR;
|
||||
MBB.clearLiveIns();
|
||||
computeAndAddLiveIns(LPR, MBB);
|
||||
}
|
||||
|
||||
} // end namespace llvm
|
||||
|
||||
#endif // LLVM_CODEGEN_LIVEPHYSREGS_H
|
||||
|
||||
@ -2007,7 +2007,6 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
|
||||
return false;
|
||||
|
||||
bool HasDups = false;
|
||||
SmallVector<unsigned, 4> LocalDefs, LocalKills;
|
||||
SmallSet<unsigned, 4> ActiveDefsSet, AllDefsSet;
|
||||
MachineBasicBlock::iterator TIB = TBB->begin();
|
||||
MachineBasicBlock::iterator FIB = FBB->begin();
|
||||
@ -2090,7 +2089,6 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
|
||||
if (!Reg)
|
||||
continue;
|
||||
if (!AllDefsSet.count(Reg)) {
|
||||
LocalKills.push_back(Reg);
|
||||
continue;
|
||||
}
|
||||
if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
|
||||
@ -2108,7 +2106,6 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
|
||||
unsigned Reg = MO.getReg();
|
||||
if (!Reg || TargetRegisterInfo::isVirtualRegister(Reg))
|
||||
continue;
|
||||
LocalDefs.push_back(Reg);
|
||||
addRegAndItsAliases(Reg, TRI, ActiveDefsSet);
|
||||
addRegAndItsAliases(Reg, TRI, AllDefsSet);
|
||||
}
|
||||
@ -2124,25 +2121,9 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
|
||||
MBB->splice(Loc, TBB, TBB->begin(), TIB);
|
||||
FBB->erase(FBB->begin(), FIB);
|
||||
|
||||
// Update livein's.
|
||||
bool ChangedLiveIns = false;
|
||||
for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
|
||||
unsigned Def = LocalDefs[i];
|
||||
if (ActiveDefsSet.count(Def)) {
|
||||
TBB->addLiveIn(Def);
|
||||
FBB->addLiveIn(Def);
|
||||
ChangedLiveIns = true;
|
||||
}
|
||||
}
|
||||
for (unsigned K : LocalKills) {
|
||||
TBB->removeLiveIn(K);
|
||||
FBB->removeLiveIn(K);
|
||||
ChangedLiveIns = true;
|
||||
}
|
||||
|
||||
if (ChangedLiveIns) {
|
||||
TBB->sortUniqueLiveIns();
|
||||
FBB->sortUniqueLiveIns();
|
||||
if (UpdateLiveIns) {
|
||||
recomputeLiveIns(*TBB);
|
||||
recomputeLiveIns(*FBB);
|
||||
}
|
||||
|
||||
++NumHoist;
|
||||
|
||||
57
test/CodeGen/SystemZ/branch-folder-hoist-livein.mir
Normal file
57
test/CodeGen/SystemZ/branch-folder-hoist-livein.mir
Normal file
@ -0,0 +1,57 @@
|
||||
# RUN: llc -verify-machineinstrs -O1 -mtriple=s390x-ibm-linux -o - %s -run-pass=branch-folder | FileCheck %s
|
||||
--- |
|
||||
target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-a:8:16-n32:64"
|
||||
target triple = "s390x-ibm-linux"
|
||||
|
||||
@b = external global i16, align 1
|
||||
@d = external global i16, align 1
|
||||
|
||||
define void @f1() {
|
||||
ret void
|
||||
}
|
||||
|
||||
...
|
||||
---
|
||||
name: f1
|
||||
tracksRegLiveness: true
|
||||
body: |
|
||||
bb.0:
|
||||
successors: %bb.2(0x7fffffff), %bb.1(0x00000001)
|
||||
liveins:
|
||||
|
||||
renamable $r1d = LGRL @b :: (load 4 from got, align 8)
|
||||
renamable $r1l = LH killed renamable $r1d, 0, $noreg, implicit-def $r1d :: (dereferenceable load 1 from @b)
|
||||
renamable $r2l = LHI 0
|
||||
renamable $r3d = LGRL @d :: (load 4 from got, align 8)
|
||||
renamable $r4d = LLILL 0, implicit-def $r4q
|
||||
|
||||
CHI killed renamable $r2l, 0, implicit-def $cc
|
||||
BRC 14, 6, %bb.2, implicit killed $cc
|
||||
J %bb.1
|
||||
|
||||
bb.1:
|
||||
successors:
|
||||
liveins: $r1l, $r3d, $r4q
|
||||
|
||||
renamable $r4d = COPY killed renamable $r4d, implicit killed $r4q
|
||||
STH renamable $r1l, killed renamable $r3d, 0, $noreg, implicit killed $r4d :: (store 1 into @d)
|
||||
|
||||
bb.2:
|
||||
liveins: $r1l, $r3d, $r4q
|
||||
|
||||
renamable $r4d = COPY killed renamable $r4d, implicit killed $r4q
|
||||
STH renamable $r1l, killed renamable $r3d, 0, $noreg, implicit killed $r4d :: (store 1 into @d)
|
||||
Return
|
||||
|
||||
...
|
||||
|
||||
# CHECK: renamable $r4d = COPY killed renamable $r4d, implicit killed $r4q
|
||||
# CHECK-NEXT: CHI killed renamable $r2l, 0, implicit-def $cc
|
||||
# CHECK-NEXT: BRC 14, 6, %bb.2, implicit killed $cc
|
||||
# CHECK-NEXT: {{^ $}}
|
||||
# CHECK-NEXT: bb.1:
|
||||
# CHECK-NEXT: successors:
|
||||
# CHECK-NEXT: liveins: $r1l, $r3d, $r4d
|
||||
|
||||
# CHECK: bb.2:
|
||||
# CHECK-NEXT: liveins: $r1l, $r3d, $r4d
|
||||
@ -48,7 +48,7 @@ body: |
|
||||
; CHECK-NEXT: $rdi = COPY $rsi
|
||||
; CHECK-NEXT: $rsi = COPY $rax
|
||||
; CHECK-NEXT: CMP64ri8 $rax, 9, implicit-def $eflags
|
||||
; CHECK-NEXT: TCRETURNdi64cc @f1, 0, 3, csr_64, implicit $rsp, implicit $eflags, implicit $ssp, implicit $rsp, implicit $rdi, implicit $rsi, implicit $rax, implicit-def $rax, implicit $hsi, implicit-def $hsi, implicit $sil, implicit-def $sil, implicit $si, implicit-def $si, implicit $esi, implicit-def $esi, implicit $rsi, implicit-def $rsi, implicit $hdi, implicit-def $hdi, implicit $dil, implicit-def $dil, implicit $di, implicit-def $di, implicit $edi, implicit-def $edi, implicit $rdi, implicit-def $rdi, implicit $hax, implicit-def $hax, implicit $ah, implicit-def $ah, implicit $al, implicit-def $al, implicit $ax, implicit-def $ax, implicit $eax, implicit-def $eax
|
||||
; CHECK-NEXT: TCRETURNdi64cc @f1, 0, 3, csr_64, implicit $rsp, implicit $eflags, implicit $ssp, implicit $rsp, implicit $rdi, implicit $rsi, implicit $rdi, implicit-def $rdi, implicit $hsi, implicit-def $hsi, implicit $sil, implicit-def $sil, implicit $si, implicit-def $si, implicit $esi, implicit-def $esi, implicit $rsi, implicit-def $rsi, implicit $hdi, implicit-def $hdi, implicit $dil, implicit-def $dil, implicit $di, implicit-def $di, implicit $edi, implicit-def $edi
|
||||
|
||||
bb.1:
|
||||
successors: %bb.2, %bb.3
|
||||
@ -67,7 +67,7 @@ body: |
|
||||
TCRETURNdi64 @f1, 0, csr_64, implicit $rsp, implicit $rdi, implicit $rsi
|
||||
|
||||
; CHECK: bb.2:
|
||||
; CHECK-NEXT: liveins: $rax, $rdi, $rsi
|
||||
; CHECK-NEXT: liveins: $rdi, $rsi
|
||||
; CHECK-NEXT: {{^ $}}
|
||||
; CHECK-NEXT: TCRETURNdi64 @f2, 0, csr_64, implicit $rsp, implicit $rdi, implicit $rsi
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user