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* get rid of calls which redirect the program flow only, Bl2B optimization

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git-svn-id: trunk@23279 -
This commit is contained in:
florian 2013-01-01 19:31:52 +00:00
parent d460d44671
commit 903f18ea38
1 changed files with 87 additions and 1 deletions
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88
compiler/arm/aoptcpu.pas
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@ -51,6 +51,8 @@ Type
{ outputs a debug message into the assembler file }
procedure DebugMsg(const s: string; p: tai);
private
function SkipEntryExitMarker(current: tai; var next: tai): boolean;
protected
function LookForPostindexedPattern(p: taicpu): boolean;
End;
@ -456,9 +458,25 @@ Implementation
end;
{ skip harmless marker marking entry/exit code, so it can be optimized as well }
function TCpuAsmOptimizer.SkipEntryExitMarker(current : tai;var next : tai) : boolean;
begin
result:=true;
if current.typ<>ait_marker then
exit;
next:=current;
while GetNextInstruction(next,next) do
begin
if (next.typ<>ait_marker) or not(tai_marker(next).Kind in [mark_Position,mark_BlockStart]) then
exit;
end;
result:=false;
end;
function TCpuAsmOptimizer.PeepHoleOptPass1Cpu(var p: tai): boolean;
var
hp1,hp2: tai;
hp1,hp2,hp3,hp4: tai;
i, i2: longint;
TmpUsedRegs: TAllUsedRegs;
tempop: tasmop;
@ -1380,6 +1398,74 @@ Implementation
RemoveRedundantMove(p, hp2, asml);
end;
end;
A_STM:
begin
{
change
stmfd r13!,[r14]
sub r13,r13,#4
bl abc
add r13,r13,#4
ldmfd r13!,[r15]
into
b abc
}
if MatchInstruction(p, A_STM, [C_None], [PF_FD]) and
GetNextInstruction(p, hp1) and
GetNextInstruction(hp1, hp2) and
SkipEntryExitMarker(hp2, hp2) and
GetNextInstruction(hp2, hp3) and
SkipEntryExitMarker(hp3, hp3) and
GetNextInstruction(hp3, hp4) and
(taicpu(p).oper[0]^.typ = top_ref) and
(taicpu(p).oper[0]^.ref^.index=NR_STACK_POINTER_REG) and
(taicpu(p).oper[0]^.ref^.base=NR_NO) and
(taicpu(p).oper[0]^.ref^.offset=0) and
(taicpu(p).oper[0]^.ref^.addressmode=AM_PREINDEXED) and
(taicpu(p).oper[1]^.typ = top_regset) and
(taicpu(p).oper[1]^.regset^ = [RS_R14]) and
MatchInstruction(hp1, A_SUB, [C_None], [PF_NONE]) and
(taicpu(hp1).oper[0]^.typ = top_reg) and
(taicpu(hp1).oper[0]^.reg = NR_STACK_POINTER_REG) and
(taicpu(hp1).oper[1]^.typ = top_reg) and
(taicpu(hp1).oper[1]^.reg = NR_STACK_POINTER_REG) and
(taicpu(hp1).oper[2]^.typ = top_const) and
MatchInstruction(hp3, A_ADD, [C_None], [PF_NONE]) and
(taicpu(hp3).oper[0]^.typ = top_reg) and
(taicpu(hp3).oper[0]^.reg = NR_STACK_POINTER_REG) and
(taicpu(hp3).oper[1]^.typ = top_reg) and
(taicpu(hp3).oper[1]^.reg = NR_STACK_POINTER_REG) and
(taicpu(hp3).oper[2]^.typ = top_const) and
(taicpu(hp1).oper[2]^.val = taicpu(hp3).oper[2]^.val) and
MatchInstruction(hp2, [A_BL,A_BLX], [C_None], [PF_NONE]) and
(taicpu(hp2).oper[0]^.typ = top_ref) and
MatchInstruction(hp4, A_LDM, [C_None], [PF_FD]) and
(taicpu(hp4).oper[0]^.typ = top_ref) and
(taicpu(hp4).oper[0]^.ref^.index=NR_STACK_POINTER_REG) and
(taicpu(hp4).oper[0]^.ref^.base=NR_NO) and
(taicpu(hp4).oper[0]^.ref^.offset=0) and
(taicpu(hp4).oper[0]^.ref^.addressmode=AM_PREINDEXED) and
(taicpu(hp4).oper[1]^.typ = top_regset) and
(taicpu(hp4).oper[1]^.regset^ = [RS_R15]) then
begin
asml.Remove(p);
asml.Remove(hp1);
asml.Remove(hp3);
asml.Remove(hp4);
taicpu(hp2).opcode:=A_B;
p.free;
hp1.free;
hp3.free;
hp4.free;
p:=hp2;
DebugMsg('Peephole Bl2B done', p);
end;
end;
end;
end;
end;