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Reducing value count. IVM could take advantage of this.

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This commit is contained in:
Ben Vanik
2014-01-25 22:47:21 -08:00
parent 05432242ff
commit c4d6c7a526
9 changed files with 250 additions and 23 deletions
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81
src/alloy/backend/x64/x64_emitter.cc
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@@ -202,8 +202,23 @@ void X64Emitter::FindFreeRegs(
Value* v0, uint32_t& v0_idx, uint32_t v0_flags,
Value* v1, uint32_t& v1_idx, uint32_t v1_flags) {
// TODO(benvanik): support REG_DEST reuse/etc.
FindFreeRegs(v0, v0_idx, v0_flags);
FindFreeRegs(v1, v1_idx, v1_flags);
// Grab all already-present registers first.
// This way we won't spill them trying to get new registers.
bool need_v0 = v0->reg != -1;
bool need_v1 = v1->reg != -1;
if (!need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (!need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
// Grab any registers we still need. These calls may evict.
if (need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
}
void X64Emitter::FindFreeRegs(
@@ -211,9 +226,30 @@ void X64Emitter::FindFreeRegs(
Value* v1, uint32_t& v1_idx, uint32_t v1_flags,
Value* v2, uint32_t& v2_idx, uint32_t v2_flags) {
// TODO(benvanik): support REG_DEST reuse/etc.
FindFreeRegs(v0, v0_idx, v0_flags);
FindFreeRegs(v1, v1_idx, v1_flags);
FindFreeRegs(v2, v2_idx, v2_flags);
// Grab all already-present registers first.
// This way we won't spill them trying to get new registers.
bool need_v0 = v0->reg != -1;
bool need_v1 = v1->reg != -1;
bool need_v2 = v2->reg != -1;
if (!need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (!need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
if (!need_v2) {
FindFreeRegs(v2, v2_idx, v2_flags);
}
// Grab any registers we still need. These calls may evict.
if (need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
if (need_v2) {
FindFreeRegs(v2, v2_idx, v2_flags);
}
}
void X64Emitter::FindFreeRegs(
@@ -222,10 +258,37 @@ void X64Emitter::FindFreeRegs(
Value* v2, uint32_t& v2_idx, uint32_t v2_flags,
Value* v3, uint32_t& v3_idx, uint32_t v3_flags) {
// TODO(benvanik): support REG_DEST reuse/etc.
FindFreeRegs(v0, v0_idx, v0_flags);
FindFreeRegs(v1, v1_idx, v1_flags);
FindFreeRegs(v2, v2_idx, v2_flags);
FindFreeRegs(v3, v3_idx, v3_flags);
// Grab all already-present registers first.
// This way we won't spill them trying to get new registers.
bool need_v0 = v0->reg != -1;
bool need_v1 = v1->reg != -1;
bool need_v2 = v2->reg != -1;
bool need_v3 = v3->reg != -1;
if (!need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (!need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
if (!need_v2) {
FindFreeRegs(v2, v2_idx, v2_flags);
}
if (!need_v3) {
FindFreeRegs(v3, v3_idx, v3_flags);
}
// Grab any registers we still need. These calls may evict.
if (need_v0) {
FindFreeRegs(v0, v0_idx, v0_flags);
}
if (need_v1) {
FindFreeRegs(v1, v1_idx, v1_flags);
}
if (need_v2) {
FindFreeRegs(v2, v2_idx, v2_flags);
}
if (need_v3) {
FindFreeRegs(v3, v3_idx, v3_flags);
}
}
void X64Emitter::MarkSourceOffset(Instr* i) {