fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

divwx/divwux.

Browse Source
This commit is contained in:
Ben Vanik
2013-05-25 02:49:44 -07:00
parent 9f3f5d2c0e
commit de85adea2e
2 changed files with 47 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/xenia/cpu/x64/x64_emitter.cc
View File

@@ -1211,22 +1211,18 @@ void X64Emitter::update_xer_value(GpVar& value) {
}
}
#if 0
void X64Emitter::update_xer_with_overflow(GpVar& value) {
X86Compiler& c = compiler_;
XEASSERT(locals_.xer.getId() != kInvalidValue);
// Expects a i1 indicating overflow.
// Trust the caller that if it's larger than that it's already truncated.
value = zero_extend(value, 1, 8);
GpVar& xer = xer_value();
xer = jit_insn_and(fn_, xer, get_uint64(0xFFFFFFFFBFFFFFFF)); // clear bit 30
xer = jit_insn_or(fn_, xer, jit_insn_shl(fn_, value, get_uint32(31)));
xer = jit_insn_or(fn_, xer, jit_insn_shl(fn_, value, get_uint32(30)));
jit_insn_store(fn_, locals_.xer, value);
GpVar xer(c.newGpVar());
c.mov(xer, xer_value());
c.and_(xer, imm(0xBFFFFFFF)); // clear bit 30
c.and_(value, imm(1));
c.shl(value, imm(30));
c.or_(xer, value);
c.shl(value, imm(31)); // also stick value
c.or_(xer, value);
update_xer_value(xer);
}
#endif
// Set with a byte value indicating carry.
void X64Emitter::update_xer_with_carry(GpVar& value) {
@@ -1234,7 +1230,7 @@ void X64Emitter::update_xer_with_carry(GpVar& value) {
GpVar xer(c.newGpVar());
c.mov(xer, xer_value());
c.and_(xer, imm(0xDFFFFFFF)); // clear bit 29
c.and_(value, imm(0xF));
c.and_(value, imm(1));
c.shl(value, imm(29));
c.or_(xer, value);
update_xer_value(xer);