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avoid mov if unnecessary

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MITSUNARI Shigeo 2013-04-17 11:20:49 +09:00
parent 82024c13a8
commit 8804abc109
2 changed files with 129 additions and 11 deletions
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122
test/sf_test.cpp
View File

@ -112,6 +112,46 @@ struct Code : public Xbyak::CodeGenerator {
mov(ptr [rsp + 8 * 2], rax);
mov(ptr [rsp + 8 * 3], rax);
}
void gen11()
{
StackFrame sf(this, 0, UseRCX);
xor_(rcx, rcx);
mov(rax, 3);
}
void gen12()
{
StackFrame sf(this, 4, UseRDX);
xor_(rdx, rdx);
mov(rax, sf.p(0));
add(rax, sf.p(1));
add(rax, sf.p(2));
add(rax, sf.p(3));
}
};
struct Code2 : Xbyak::CodeGenerator {
Code2()
: Xbyak::CodeGenerator(4096 * 32)
{
}
void gen(int pNum, int tNum, int stackSizeByte)
{
StackFrame sf(this, pNum, tNum, stackSizeByte);
if (tNum & UseRCX) xor_(rcx, rcx);
if (tNum & UseRDX) xor_(rdx, rdx);
for (int i = 0, n = tNum & ~(UseRCX | UseRDX); i < n; i++) {
mov(sf.t(i), 5);
}
for (int i = 0; i < stackSizeByte; i++) {
mov(byte [rsp + i], 0);
}
mov(rax, 1);
for (int i = 0; i < pNum; i++) {
add(rax, sf.p(i));
}
}
};
static int errNum = 0;
@ -123,7 +163,62 @@ void check(int x, int y)
}
}
int main()
void verify(const Xbyak::uint8 *f, int pNum)
{
switch (pNum) {
case 0:
check(1, Xbyak::CastTo<int (*)()>(f)());
return;
case 1:
check(11, Xbyak::CastTo<int (*)(int)>(f)(10));
return;
case 2:
check(111, Xbyak::CastTo<int (*)(int, int)>(f)(10, 100));
return;
case 3:
check(1111, Xbyak::CastTo<int (*)(int, int, int)>(f)(10, 100, 1000));
return;
case 4:
check(11111, Xbyak::CastTo<int (*)(int, int, int, int)>(f)(10, 100, 1000, 10000));
return;
default:
printf("ERR pNum=%d\n", pNum);
exit(1);
}
}
void testAll()
{
Code2 code;
for (int stackSize = 0; stackSize < 32; stackSize += 7) {
for (int pNum = 0; pNum < 4; pNum++) {
for (int mode = 0; mode < 4; mode++) {
int maxNum = 0;
int opt = 0;
if (mode == 0) {
maxNum = 10;
} else if (mode == 1) {
maxNum = 9;
opt = UseRCX;
} else if (mode == 2) {
maxNum = 9;
opt = UseRDX;
} else {
maxNum = 8;
opt = UseRCX | UseRDX;
}
for (int tNum = 0; tNum < maxNum; tNum++) {
printf("pNum=%d, tNum=%d, stackSize=%d\n", pNum, tNum | opt, stackSize);
const Xbyak::uint8 *f = code.getCurr();
code.gen(pNum, tNum | opt, stackSize);
verify(f, pNum);
}
}
}
}
}
void testPartial()
{
Code code;
int (*f1)(int) = code.getCurr<int (*)(int)>();
@ -165,5 +260,28 @@ int main()
int (*f10)(int, int, int, int) = code.getCurr<int (*)(int, int, int, int)>();
code.gen10();
check(100, f10(10, 20, 30, 40));
printf("errNum=%d\n", errNum);
int (*f11)() = code.getCurr<int (*)()>();
code.gen11();
check(3, f11());
int (*f12)(int, int, int, int) = code.getCurr<int (*)(int, int, int, int)>();
code.gen12();
check(24, f12(3, 5, 7, 9));
}
int main()
try
{
testAll();
testPartial();
printf("errNum=%d\n", errNum);
} catch (const Xbyak::Error& e) {
printf("err %s\n", Xbyak::ConvertErrorToString(e));
return 1;
} catch (...) {
puts("ERR");
return 1;
}

18
xbyak/xbyak_util.h
View File

@ -239,9 +239,13 @@ const int UseRDX = 1 << 7;
class StackFrame {
#ifdef XBYAK64_WIN
static const int noSaveNum = 6;
static const int noSaveNum = 6;
static const int rcxPos = 0;
static const int rdxPos = 1;
#else
static const int noSaveNum = 8;
static const int rcxPos = 3;
static const int rdxPos = 2;
#endif
Xbyak::CodeGenerator *code_;
int pNum_;
@ -321,6 +325,8 @@ public:
for (int i = 0; i < tNum_; i++) {
tTbl_[i] = Xbyak::Reg64(getRegIdx(pos));
}
if (useRcx_ && rcxPos < pNum) code_->mov(code_->r10, code_->rcx);
if (useRdx_ && rdxPos < pNum) code_->mov(code_->r11, code_->rdx);
}
/*
make epilog manually
@ -373,17 +379,11 @@ private:
const int *tbl = getOrderTbl();
int r = tbl[pos++];
if (useRcx_) {
if (r == Operand::RCX) {
code_->mov(code_->r10, code_->rcx);
return Operand::R10;
}
if (r == Operand::RCX) { return Operand::R10; }
if (r == Operand::R10) { r = tbl[pos++]; }
}
if (useRdx_) {
if (r == Operand::RDX) {
code_->mov(code_->r11, code_->rdx);
return Operand::R11;
}
if (r == Operand::RDX) { return Operand::R11; }
if (r == Operand::R11) { return tbl[pos++]; }
}
return r;