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fix integer shifts on PowerPC

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This commit is contained in:
Joel Dice 2012-08-13 11:17:34 -06:00
parent 665c4448bd
commit 95cf6cf941
1 changed files with 54 additions and 30 deletions
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84
src/powerpc.cpp
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@ -672,6 +672,10 @@ write4(uint8_t* dst, uint32_t v)
memcpy(dst, &v, 4);
}
void
andC(Context* c, unsigned size, Assembler::Constant* a,
Assembler::Register* b, Assembler::Register* dst);
void shiftLeftR(Context* con, unsigned size, Assembler::Register* a, Assembler::Register* b, Assembler::Register* t)
{
if(size == 8) {
@ -683,25 +687,36 @@ void shiftLeftR(Context* con, unsigned size, Assembler::Register* a, Assembler::
emit(con, addi(tmp->high, a->low, -32));
emit(con, slw(tmp->low, b->low, tmp->high));
emit(con, or_(t->high, t->high, tmp->low));
emit(con, slw(t->low, b->low, a->low));
freeTemp(con, tmp->high); freeTemp(con, tmp->low);
} else {
emit(con, slw(t->low, b->low, a->low));
}
emit(con, slw(t->low, b->low, a->low));
}
void
moveRR(Context* c, unsigned srcSize, Assembler::Register* src,
unsigned dstSize, Assembler::Register* dst);
void shiftLeftC(Context* con, unsigned size, Assembler::Constant* a, Assembler::Register* b, Assembler::Register* t)
{
int sh = getValue(a);
if (size == 8) {
if (sh < 32) {
emit(con, rlwinm(t->high,b->high,sh,0,31-sh));
emit(con, rlwimi(t->high,b->low,sh,32-sh,31));
emit(con, slwi(t->low, b->low, sh));
sh &= 0x3F;
if (sh) {
if (sh < 32) {
emit(con, rlwinm(t->high,b->high,sh,0,31-sh));
emit(con, rlwimi(t->high,b->low,sh,32-sh,31));
emit(con, slwi(t->low, b->low, sh));
} else {
emit(con, rlwinm(t->high,b->low,sh-32,0,63-sh));
emit(con, li(t->low,0));
}
} else {
emit(con, rlwinm(t->high,b->low,sh-32,0,63-sh));
emit(con, li(t->low,0));
moveRR(con, size, b, size, t);
}
} else {
emit(con, slwi(t->low, b->low, sh));
emit(con, slwi(t->low, b->low, sh & 0x1F));
}
}
@ -728,16 +743,21 @@ void shiftRightC(Context* con, unsigned size, Assembler::Constant* a, Assembler:
{
int sh = getValue(a);
if(size == 8) {
if (sh < 32) {
emit(con, rlwinm(t->low,b->low,32-sh,sh,31));
emit(con, rlwimi(t->low,b->high,32-sh,0,sh-1));
emit(con, srawi(t->high,b->high,sh));
sh &= 0x3F;
if (sh) {
if (sh < 32) {
emit(con, rlwinm(t->low,b->low,32-sh,sh,31));
emit(con, rlwimi(t->low,b->high,32-sh,0,sh-1));
emit(con, srawi(t->high,b->high,sh));
} else {
emit(con, srawi(t->high,b->high,31));
emit(con, srawi(t->low,b->high,sh-32));
}
} else {
emit(con, srawi(t->high,b->high,31));
emit(con, srawi(t->low,b->high,sh-32));
moveRR(con, size, b, size, t);
}
} else {
emit(con, srawi(t->low, b->low, sh));
emit(con, srawi(t->low, b->low, sh & 0x1F));
}
}
@ -757,28 +777,32 @@ void unsignedShiftRightR(Context* con, unsigned size, Assembler::Register* a, As
}
}
void
moveRR(Context* c, unsigned srcSize, Assembler::Register* src,
unsigned dstSize, Assembler::Register* dst);
void unsignedShiftRightC(Context* con, unsigned size, Assembler::Constant* a, Assembler::Register* b, Assembler::Register* t)
{
int sh = getValue(a);
if (size == 8) {
if (sh == 32) {
Assembler::Register high(b->high);
moveRR(con, 4, &high, 4, t);
emit(con, li(t->high,0));
} else if (sh < 32) {
emit(con, srwi(t->low, b->low, sh));
emit(con, rlwimi(t->low,b->high,32-sh,0,sh-1));
emit(con, rlwinm(t->high,b->high,32-sh,sh,31));
if (sh & 0x3F) {
if (sh == 32) {
Assembler::Register high(b->high);
moveRR(con, 4, &high, 4, t);
emit(con, li(t->high,0));
} else if (sh < 32) {
emit(con, srwi(t->low, b->low, sh));
emit(con, rlwimi(t->low,b->high,32-sh,0,sh-1));
emit(con, rlwinm(t->high,b->high,32-sh,sh,31));
} else {
emit(con, rlwinm(t->low,b->high,64-sh,sh-32,31));
emit(con, li(t->high,0));
}
} else {
emit(con, rlwinm(t->low,b->high,64-sh,sh-32,31));
emit(con, li(t->high,0));
moveRR(con, size, b, size, t);
}
} else {
emit(con, srwi(t->low, b->low, sh));
if (sh & 0x1F) {
emit(con, srwi(t->low, b->low, sh & 0x1F));
} else {
moveRR(con, size, b, size, t);
}
}
}