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Fixing the rlw* instructions.

This commit is contained in:
Ben Vanik 2015-12-30 09:02:29 -08:00
parent b09e32ec15
commit 74d71f7a4a
3 changed files with 24 additions and 26 deletions
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44
src/xenia/cpu/ppc/ppc_emit_alu.cc
View File

@ -958,18 +958,19 @@ int InstrEmit_rlwimix(PPCHIRBuilder& f, const InstrData& i) {
// r <- ROTL32((RS)[32:63], n)
// m <- MASK(MB+32, ME+32)
// RA <- r&m | (RA)&¬m
Value* v = f.Truncate(f.LoadGPR(i.M.RT), INT32_TYPE);
Value* v = f.LoadGPR(i.M.RT);
// (x||x)
v = f.Or(f.Shl(v, 32), f.And(v, f.LoadConstantUint64(0xFFFFFFFF)));
if (i.M.SH) {
v = f.RotateLeft(v, f.LoadConstantUint32(i.M.SH));
v = f.RotateLeft(v, f.LoadConstantInt8(i.M.SH));
}
// Compiler sometimes masks with 0xFFFFFFFF (identity) - avoid the work here
// as our truncation/zero-extend does it for us.
uint32_t m = (uint32_t)XEMASK(i.M.MB + 32, i.M.ME + 32);
if (!(i.M.MB == 0 && i.M.ME == 31)) {
v = f.And(v, f.LoadConstantUint32(m));
uint64_t m = XEMASK(i.M.MB + 32, i.M.ME + 32);
if (m != 0xFFFFFFFFFFFFFFFFull) {
v = f.And(v, f.LoadConstantUint64(m));
}
v = f.ZeroExtend(v, INT64_TYPE);
v = f.Or(v, f.And(f.LoadGPR(i.M.RA), f.LoadConstantUint64(~(uint64_t)m)));
v = f.Or(v, f.And(f.LoadGPR(i.M.RA), f.LoadConstantUint64(~m)));
f.StoreGPR(i.M.RA, v);
if (i.M.Rc) {
f.UpdateCR(0, v);
@ -982,22 +983,23 @@ int InstrEmit_rlwinmx(PPCHIRBuilder& f, const InstrData& i) {
// r <- ROTL32((RS)[32:63], n)
// m <- MASK(MB+32, ME+32)
// RA <- r & m
Value* v = f.Truncate(f.LoadGPR(i.M.RT), INT32_TYPE);
Value* v = f.LoadGPR(i.M.RT);
// (x||x)
v = f.Or(f.Shl(v, 32), f.And(v, f.LoadConstantUint64(0xFFFFFFFF)));
// TODO(benvanik): optimize srwi
// TODO(benvanik): optimize slwi
// The compiler will generate a bunch of these for the special case of SH=0.
// Which seems to just select some bits and set cr0 for use with a branch.
// We can detect this and do less work.
if (i.M.SH) {
v = f.RotateLeft(v, f.LoadConstantUint32(i.M.SH));
v = f.RotateLeft(v, f.LoadConstantInt8(i.M.SH));
}
// Compiler sometimes masks with 0xFFFFFFFF (identity) - avoid the work here
// as our truncation/zero-extend does it for us.
if (!(i.M.MB == 0 && i.M.ME == 31)) {
v = f.And(v,
f.LoadConstantUint32(uint32_t(XEMASK(i.M.MB + 32, i.M.ME + 32))));
uint64_t m = XEMASK(i.M.MB + 32, i.M.ME + 32);
if (m != 0xFFFFFFFFFFFFFFFFull) {
v = f.And(v, f.LoadConstantUint64(m));
}
v = f.ZeroExtend(v, INT64_TYPE);
f.StoreGPR(i.M.RA, v);
if (i.M.Rc) {
f.UpdateCR(0, v);
@ -1010,17 +1012,13 @@ int InstrEmit_rlwnmx(PPCHIRBuilder& f, const InstrData& i) {
// r <- ROTL32((RS)[32:63], n)
// m <- MASK(MB+32, ME+32)
// RA <- r & m
Value* v = f.Truncate(f.LoadGPR(i.M.RT), INT32_TYPE);
Value* sh = f.And(f.Truncate(f.LoadGPR(i.M.SH), INT32_TYPE),
f.LoadConstantUint32(0x1F));
Value* sh =
f.And(f.Truncate(f.LoadGPR(i.M.SH), INT8_TYPE), f.LoadConstantInt8(0x1F));
Value* v = f.LoadGPR(i.M.RT);
// (x||x)
v = f.Or(f.Shl(v, 32), f.And(v, f.LoadConstantUint64(0xFFFFFFFF)));
v = f.RotateLeft(v, sh);
// Compiler sometimes masks with 0xFFFFFFFF (identity) - avoid the work here
// as our truncation/zero-extend does it for us.
if (!(i.M.MB == 0 && i.M.ME == 31)) {
v = f.And(v,
f.LoadConstantUint32(uint32_t(XEMASK(i.M.MB + 32, i.M.ME + 32))));
}
v = f.ZeroExtend(v, INT64_TYPE);
v = f.And(v, f.LoadConstantUint64(XEMASK(i.M.MB + 32, i.M.ME + 32)));
f.StoreGPR(i.M.RA, v);
if (i.M.Rc) {
f.UpdateCR(0, v);

2
src/xenia/cpu/ppc/testing/instr_rlwinm.s
View File

@ -253,7 +253,7 @@ test_rlwinm_11:
rlwinm r6, r8, 8, 2, 0
blr
#_ REGISTER_OUT r6 0xABCDEF89ABCDEF89
#_ REGISTER_OUT r8 0x1
#_ REGISTER_OUT r8 0x0123456789ABCDEF
test_rlwinm_12:
#_ REGISTER_IN r4 0xFFFFFFFFFFFFFFFF

4
src/xenia/cpu/ppc/testing/instr_rlwnm.s
View File

@ -202,8 +202,8 @@ test_rlwnm_12:
#_ REGISTER_IN r3 0xFFFFFFFF
rlwnm r0, r3, r3, 30, 1
blr
#_ REGISTER_OUT r0 0x1
#_ REGISTER_OUT r3 0xFFFFFFFFC0000003
#_ REGISTER_OUT r0 0xFFFFFFFFC0000003
#_ REGISTER_OUT r3 0xFFFFFFFF
test_rlwnm_13:
#_ REGISTER_IN r7 0x01234567