github-wownero/RandomX
1
0
Fork 0
mirror of https://github.com/wownero/RandomX.git synced 2026-10-17 23:41:39 +02:00
Code Issues Packages Projects Releases Wiki Activity

8 branch conditions for CALL/RET

Browse Source
This commit is contained in:
tevador
2018-12-21 22:41:35 +01:00
parent 55afe9646f
commit 740c40b218
11 changed files with 1396 additions and 1051 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/JitCompilerX86.cpp
+40 -25
View File
@@ -657,20 +657,41 @@ namespace RandomX {
gencf(instr);
}
void JitCompilerX86::h_CALL(Instruction& instr, int i) {
if ((instr.locb & 7) <= 5) {
emit(uint16_t(0x8141)); //cmp regb, imm32
emitByte(0xf8 + (instr.regb % RegistersCount));
emit(instr.imm32);
if ((instr.locc & 7) <= 3) {
emit(uint16_t(0x1676)); //jmp
}
else {
emit(uint16_t(0x0576)); //jmp
}
gencr(instr);
emit(uint16_t(0x06eb)); //jmp to next
static inline uint8_t jumpCondition(Instruction& instr, bool invert = false) {
switch ((instr.locb & 7) ^ invert)
{
case 0:
return 0x76; //jbe
case 1:
return 0x77; //ja
case 2:
return 0x78; //js
case 3:
return 0x79; //jns
case 4:
return 0x70; //jo
case 5:
return 0x71; //jno
case 6:
return 0x7c; //jl
case 7:
return 0x7d; //jge
}
}
void JitCompilerX86::h_CALL(Instruction& instr, int i) {
emit(uint16_t(0x8141)); //cmp regb, imm32
emitByte(0xf8 + (instr.regb % RegistersCount));
emit(instr.imm32);
emitByte(jumpCondition(instr));
if ((instr.locc & 7) <= 3) {
emitByte(0x16);
}
else {
emitByte(0x05);
}
gencr(instr);
emit(uint16_t(0x06eb)); //jmp to next
emitByte(0x50); //push rax
emitByte(0xe8); //call
i = wrapInstr(i + (instr.imm8 & 127) + 2);
@@ -685,22 +706,16 @@ namespace RandomX {
void JitCompilerX86::h_RET(Instruction& instr, int i) {
int crlen = 0;
int blen = 0;
if ((instr.locc & 7) <= 3) {
crlen = 17;
}
if ((instr.locb & 7) <= 5) {
blen = 9;
}
emit(0x74e53b48); //cmp rsp, rbp; je
emitByte(11 + blen + crlen);
if ((instr.locb & 7) <= 5) {
emit(uint16_t(0x8141)); //cmp regb, imm32
emitByte(0xf8 + (instr.regb % RegistersCount));
emit(instr.imm32);
emitByte(0x77); //jmp
emitByte(11 + crlen);
}
emitByte(20 + crlen);
emit(uint16_t(0x8141)); //cmp regb, imm32
emitByte(0xf8 + (instr.regb % RegistersCount));
emit(instr.imm32);
emitByte(jumpCondition(instr, true));
emitByte(11 + crlen);
emitByte(0x48);
emit(0x08244433); //xor rax,QWORD PTR [rsp+0x8]
gencr(instr);