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Optimized GetScalarNZM, add limit to how far it can recurse. Add rlwinm elimination rule

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This commit is contained in:
chss95cs@gmail.com
2022-07-14 14:32:14 -07:00
parent 1d00372e6b
commit 71c5f8f0fa
4 changed files with 341 additions and 90 deletions
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23
src/xenia/cpu/compiler/passes/simplification_pass.h
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@@ -16,7 +16,7 @@ namespace xe {
namespace cpu {
namespace compiler {
namespace passes {
using ScalarNZM = uint64_t;
class SimplificationPass : public ConditionalGroupSubpass {
public:
SimplificationPass();
@@ -44,14 +44,27 @@ class SimplificationPass : public ConditionalGroupSubpass {
bool CheckSelect(hir::Instr* i, hir::HIRBuilder* builder);
bool CheckScalarConstCmp(hir::Instr* i, hir::HIRBuilder* builder);
bool CheckIsTrueIsFalse(hir::Instr* i, hir::HIRBuilder* builder);
// for rlwinm
bool TryHandleANDROLORSHLSeq(hir::Instr* i, hir::HIRBuilder* builder);
bool TransformANDROLORSHLSeq(
hir::Instr* i, // the final instr in the rlwinm sequence (the AND)
hir::HIRBuilder* builder,
ScalarNZM input_nzm, // the NZM of the value being rot'ed/masked (input)
uint64_t mask, // mask after rotation
uint64_t rotation, // rot amount prior to masking
hir::Instr* input_def, // the defining instr of the input var
hir::Value* input // the input variable to the rlwinm
);
static bool Is1BitOpcode(hir::Opcode def_opcode);
static uint64_t GetScalarNZM(hir::Value* value, hir::Instr* def,
uint64_t typemask, hir::Opcode def_opcode);
/* we currently have no caching, and although it is rare some games
may have massive (in the hundreds) chains of ands + ors + shifts in
a single unbroken basic block (exsploderman web of shadows) */
static constexpr unsigned MAX_NZM_DEPTH = 16;
// todo: use valuemask
// returns maybenonzeromask for value (mask of bits that may possibly hold
// information)
static uint64_t GetScalarNZM(hir::Value* value);
static ScalarNZM GetScalarNZM(const hir::Value* value, unsigned depth = 0);
};
} // namespace passes