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reg_alloc: Deduplicate constants in RegAlloc::HostCall that were already defined by abi.h

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This commit is contained in:
MerryMage 2016-08-26 18:43:50 +01:00
parent 59a8e14d1c
commit 7fedf04e79
1 changed files with 19 additions and 23 deletions
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42
src/backend_x64/reg_alloc.cpp
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@ -9,6 +9,7 @@
#include <xbyak.h>
#include "backend_x64/abi.h"
#include "backend_x64/jitstate.h"
#include "backend_x64/reg_alloc.h"
#include "common/assert.h"
@ -273,42 +274,37 @@ HostLoc RegAlloc::ScratchHostLocReg(HostLocList desired_locations) {
}
void RegAlloc::HostCall(IR::Inst* result_def, IR::Value arg0_use, IR::Value arg1_use, IR::Value arg2_use, IR::Value arg3_use) {
constexpr HostLoc AbiReturn = HostLoc::RAX;
#ifdef _WIN32
constexpr std::array<HostLoc, 4> AbiArgs = { HostLoc::RCX, HostLoc::RDX, HostLoc::R8, HostLoc::R9 };
/// Caller-saved registers other than AbiReturn or AbiArgs
constexpr std::array<HostLoc, 2> OtherCallerSave = { HostLoc::R10, HostLoc::R11 };
#else
constexpr std::array<HostLoc, 4> AbiArgs = { HostLoc::RDI, HostLoc::RSI, HostLoc::RDX, HostLoc::RCX };
/// Caller-saved registers other than AbiReturn or AbiArgs
constexpr std::array<HostLoc, 4> OtherCallerSave = { HostLoc::R8, HostLoc::R9, HostLoc::R10, HostLoc::R11 };
#endif
constexpr size_t args_count = 4;
constexpr std::array<HostLoc, args_count> args_hostloc = { ABI_PARAM1, ABI_PARAM2, ABI_PARAM3, ABI_PARAM4 };
const std::array<IR::Value*, args_count> args = {&arg0_use, &arg1_use, &arg2_use, &arg3_use};
const std::array<IR::Value*, 4> args = {&arg0_use, &arg1_use, &arg2_use, &arg3_use};
const static std::vector<HostLoc> other_caller_save = [](){
std::vector<HostLoc> ret(ABI_ALL_CALLER_SAVE.begin(), ABI_ALL_CALLER_SAVE.end());
for (auto hostloc : {ABI_RETURN, ABI_PARAM1, ABI_PARAM2, ABI_PARAM3, ABI_PARAM4})
ret.erase(std::find(ret.begin(), ret.end(), hostloc));
return ret;
}();
// TODO: This works but almost certainly leads to suboptimal generated code.
for (HostLoc caller_save : OtherCallerSave) {
ScratchHostLocReg({caller_save});
}
if (result_def) {
DefHostLocReg(result_def, {AbiReturn});
DefHostLocReg(result_def, {ABI_RETURN});
} else {
ScratchHostLocReg({AbiReturn});
ScratchHostLocReg({ABI_RETURN});
}
for (size_t i = 0; i < AbiArgs.size(); i++) {
for (size_t i = 0; i < args_count; i++) {
if (!args[i]->IsEmpty()) {
UseScratchHostLocReg(*args[i], {AbiArgs[i]});
UseScratchHostLocReg(*args[i], {args_hostloc[i]});
} else {
ScratchHostLocReg({AbiArgs[i]});
ScratchHostLocReg({args_hostloc[i]});
}
}
// Flush all xmm registers
for (auto xmm : any_xmm) {
ScratchHostLocReg({xmm});
for (HostLoc caller_saved : other_caller_save) {
ScratchHostLocReg({caller_saved});
}
}