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Cleaning up function registers and setting up CR.

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This commit is contained in:
Ben Vanik
2013-01-26 01:25:31 -08:00
parent 9b3d96a8ae
commit 733fe85d37
5 changed files with 267 additions and 159 deletions
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28
src/cpu/codegen/emit_alu.cc
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@@ -242,23 +242,25 @@ XEEMITTER(subfzex, 0x7C000190, XO )(FunctionGenerator& g, IRBuilder<>& b, I
void XeEmitCompareCore(FunctionGenerator& g, IRBuilder<>& b,
Value* lhs, Value* rhs, uint32_t BF, bool is_signed) {
// bit0 = RA < RB
// bit1 = RA > RB
// bit2 = RA = RB
// bit3 = XER[SO]
// Bits are reversed:
// 0123
// 3210
Value* is_lt = is_signed ?
b.CreateICmpSLT(lhs, rhs) : b.CreateICmpULT(lhs, rhs);
Value* is_gt = is_signed ?
b.CreateICmpSGT(lhs, rhs) : b.CreateICmpUGT(lhs, rhs);
Value* cp = b.CreateSelect(is_gt, b.getInt8(0x2), b.getInt8(0x1));
Value* c = b.CreateSelect(is_lt, b.getInt8(0x4), cp);
c = b.CreateZExt(c, b.getInt64Ty());
Value* cp = b.CreateSelect(is_gt, b.getInt8(1 << 2), b.getInt8(1 << 1));
Value* c = b.CreateSelect(is_lt, b.getInt8(1 << 3), cp);
// TODO(benvanik): set bit 4 to XER[SO]
// Insert the 4 bits into their location in the CR.
Value* cr = g.cr_value();
uint32_t mask = XEBITMASK((4 + BF) * 4, (4 + BF) * 4 + 4);
cr = b.CreateAnd(cr, mask);
cr = b.CreateOr(cr, b.CreateShl(c, (4 + BF) * 4));
g.update_cr_value(cr);
g.update_cr_value(BF, c);
}
XEEMITTER(cmp, 0x7C000000, X )(FunctionGenerator& g, IRBuilder<>& b, InstrData& i) {
@@ -660,14 +662,6 @@ XEEMITTER(rlwinmx, 0x54000000, M )(FunctionGenerator& g, IRBuilder<>& b, I
return 0;
}
// if mstart ≤ mstop then
// mask[mstart:mstop] = ones
// mask[all other bits] = zeros
// else
// mask[mstart:63] = ones
// mask[0:mstop] = ones
// mask[all other bits] = zeros
// // ROTL32(x, y) = rotl(i64.(x||x), y)
// Value* v = b.CreateZExt(b.CreateTrunc(g.gpr_value(i.M.RS)), b.getInt64Ty());
// v = b.CreateOr(b.CreateLShr(v, 32), v);