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Reduced the size of the cycles accumulate code.

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OBattler
2022-10-17 04:13:19 +02:00
parent 6311f4bdc5
commit 96ec40d794
2 changed files with 16 additions and 12 deletions
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18
src/codegen/codegen_accumulate_x86-64.c
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@@ -47,17 +47,17 @@ void codegen_accumulate(int acc_reg, int delta)
void codegen_accumulate_flush(void) void codegen_accumulate_flush(void)
{ {
intptr_t rip;
if (acc_regs[0].count) { if (acc_regs[0].count) {
addbyte(0x55); /*push rbp*/ /* To reduce the size of the generated code, we take advantage of
addbyte(0x48); /*mov rbp,val*/ the fact that the target offset points to _cycles within cpu_state,
addbyte(0xbd); so we can just use our existing infrastracture for variables
addlong((uint32_t) (acc_regs[0].dest_reg & 0xffffffffULL)); relative to cpu_state. */
addlong((uint32_t) (acc_regs[0].dest_reg >> 32ULL)); addbyte(0x81); /*ADDL $acc_regs[0].count,(_cycles)*/
addbyte(0x81); /* add d,[rbp][0],val */ addbyte(0x45);
addbyte(0x45); addbyte((uint8_t)cpu_state_offset(_cycles));
addbyte(0x00);
addlong(acc_regs[0].count); addlong(acc_regs[0].count);
addbyte(0x5d); /*pop rbp*/
} }
acc_regs[0].count = 0; acc_regs[0].count = 0;

10
src/codegen/codegen_accumulate_x86.c
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@@ -45,9 +45,13 @@ void codegen_accumulate(int acc_reg, int delta)
void codegen_accumulate_flush(void) void codegen_accumulate_flush(void)
{ {
if (acc_regs[0].count) { if (acc_regs[0].count) {
addbyte(0x81); /*ADD $acc_regs[0].count,acc_regs[0].dest*/ /* To reduce the size of the generated code, we take advantage of
addbyte(0x05); the fact that the target offset points to _cycles within cpu_state,
addlong((uint32_t) acc_regs[0].dest_reg); so we can just use our existing infrastracture for variables
relative to cpu_state. */
addbyte(0x81); /*MOVL $acc_regs[0].count,(_cycles)*/
addbyte(0x45);
addbyte((uint8_t)cpu_state_offset(_cycles));
addlong(acc_regs[0].count); addlong(acc_regs[0].count);
} }