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[Sparc] Prevent instructions that defines or uses %o7 to be in call's delay slot.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182063 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Venkatraman Govindaraju 2013-05-16 23:53:29 +00:00
parent df68803890
commit d6b4caf291
2 changed files with 26 additions and 5 deletions
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14
lib/Target/Sparc/DelaySlotFiller.cpp
View File

@ -61,8 +61,9 @@ namespace {
bool isDelayFiller(MachineBasicBlock &MBB,
MachineBasicBlock::iterator candidate);
void insertCallUses(MachineBasicBlock::iterator MI,
SmallSet<unsigned, 32>& RegUses);
void insertCallDefsUses(MachineBasicBlock::iterator MI,
SmallSet<unsigned, 32>& RegDefs,
SmallSet<unsigned, 32>& RegUses);
void insertDefsUses(MachineBasicBlock::iterator MI,
SmallSet<unsigned, 32>& RegDefs,
@ -150,7 +151,7 @@ Filler::findDelayInstr(MachineBasicBlock &MBB,
//Call's delay filler can def some of call's uses.
if (slot->isCall())
insertCallUses(slot, RegUses);
insertCallDefsUses(slot, RegDefs, RegUses);
else
insertDefsUses(slot, RegDefs, RegUses);
@ -230,9 +231,12 @@ bool Filler::delayHasHazard(MachineBasicBlock::iterator candidate,
}
void Filler::insertCallUses(MachineBasicBlock::iterator MI,
SmallSet<unsigned, 32>& RegUses)
void Filler::insertCallDefsUses(MachineBasicBlock::iterator MI,
SmallSet<unsigned, 32>& RegDefs,
SmallSet<unsigned, 32>& RegUses)
{
//Call defines o7, which is visible to the instruction in delay slot.
RegDefs.insert(SP::O7);
switch(MI->getOpcode()) {
default: llvm_unreachable("Unknown opcode.");

17
test/CodeGen/SPARC/2011-01-19-DelaySlot.ll
View File

@ -87,4 +87,21 @@ entry:
ret i32 0
}
define i32 @prevent_o7_in_call_delay_slot(i32 %i0) {
entry:
;CHECK: prevent_o7_in_call_delay_slot
;CHECK: add %i0, 2, %o5
;CHECK: add %i0, 3, %o7
;CHECK: add %o5, %o7, %o0
;CHECK: call bar
;CHECK-NEXT: nop
%0 = add nsw i32 %i0, 2
%1 = add nsw i32 %i0, 3
tail call void asm sideeffect "", "r,r,~{l0},~{l1},~{l2},~{l3},~{l4},~{l5},~{l6},~{l7},~{i0},~{i1},~{i2},~{i3},~{i4},~{i5},~{i6},~{i7},~{o0},~{o1},~{o2},~{o3},~{o4}"(i32 %0, i32 %1)
%2 = add nsw i32 %0, %1
%3 = tail call i32 @bar(i32 %2)
ret i32 %3
}
declare i32 @func(i32*)