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a little code optimization, no impact on correctness

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This commit is contained in:
Stanislav Shwartsman 2024-01-29 15:28:25 +02:00
parent 0cfa33733e
commit 6554f9b7b6
1 changed files with 42 additions and 38 deletions
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80
bochs/cpu/xsave.cc
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@ -623,12 +623,12 @@ void BX_CPU_C::xsave_sse_state(bxInstruction_c *i, bx_address offset)
{
bx_address asize_mask = i->asize_mask();
// save XMM8-XMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
/* store XMM register file */
for(unsigned index=0; index < 16; index++) {
// save XMM8-XMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
write_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_XMM_REG(index));
}
for(unsigned index=0; index < num_regs; index++) {
write_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_XMM_REG(index));
}
}
@ -636,32 +636,34 @@ void BX_CPU_C::xrstor_sse_state(bxInstruction_c *i, bx_address offset)
{
bx_address asize_mask = i->asize_mask();
// restore XMM8-XMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
// load SSE state from XSAVE area
for(unsigned index=0; index < 16; index++) {
// restore XMM8-XMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
read_virtual_xmmword(i->seg(), (offset+index*16) & asize_mask, &BX_READ_XMM_REG(index));
}
for(unsigned index=0; index < num_regs; index++) {
read_virtual_xmmword(i->seg(), (offset+index*16) & asize_mask, &BX_READ_XMM_REG(index));
}
}
void BX_CPU_C::xrstor_init_sse_state(void)
{
// set XMM8-XMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
// initialize SSE with reset values
for(unsigned index=0; index < 16; index++) {
// set XMM8-XMM15 only in 64-bit mode
if (index < 8 || long64_mode()) BX_CLEAR_XMM_REG(index);
for(unsigned index=0; index < num_regs; index++) {
BX_CLEAR_XMM_REG(index);
}
}
bool BX_CPU_C::xsave_sse_state_xinuse(void)
{
for(unsigned index=0; index < 16; index++) {
// set XMM8-XMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
const BxPackedXmmRegister *reg = &BX_XMM_REG(index);
if (! is_clear(reg)) return true;
}
// set XMM8-XMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
for(unsigned index=0; index < num_regs; index++) {
const BxPackedXmmRegister *reg = &BX_XMM_REG(index);
if (! is_clear(reg)) return true;
}
return false;
@ -675,12 +677,12 @@ void BX_CPU_C::xsave_ymm_state(bxInstruction_c *i, bx_address offset)
{
bx_address asize_mask = i->asize_mask();
// save YMM8-YMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
/* store AVX state */
for(unsigned index=0; index < 16; index++) {
// save YMM8-YMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
write_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_AVX_REG_LANE(index, 1));
}
for(unsigned index=0; index < num_regs; index++) {
write_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_AVX_REG_LANE(index, 1));
}
}
@ -688,32 +690,34 @@ void BX_CPU_C::xrstor_ymm_state(bxInstruction_c *i, bx_address offset)
{
bx_address asize_mask = i->asize_mask();
// restore YMM8-YMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
// load AVX state from XSAVE area
for(unsigned index=0; index < 16; index++) {
// restore YMM8-YMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
read_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_AVX_REG_LANE(index, 1));
}
for(unsigned index=0; index < num_regs; index++) {
read_virtual_xmmword(i->seg(), (offset + index*16) & asize_mask, &BX_READ_AVX_REG_LANE(index, 1));
}
}
void BX_CPU_C::xrstor_init_ymm_state(void)
{
// set YMM8-YMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
// initialize upper part of AVX registers with reset values
for(unsigned index=0; index < 16; index++) {
// set YMM8-YMM15 only in 64-bit mode
if (index < 8 || long64_mode()) BX_CLEAR_AVX_HIGH128(index);
for(unsigned index=0; index < num_regs; index++) {
BX_CLEAR_AVX_HIGH128(index);
}
}
bool BX_CPU_C::xsave_ymm_state_xinuse(void)
{
for(unsigned index=0; index < 16; index++) {
// set YMM8-YMM15 only in 64-bit mode
if (index < 8 || long64_mode()) {
const BxPackedXmmRegister *reg = &BX_READ_AVX_REG_LANE(index, 1);
if (! is_clear(reg)) return true;
}
// set YMM8-YMM15 only in 64-bit mode
unsigned num_regs = long64_mode() ? 16 : 8;
for(unsigned index=0; index < num_regs; index++) {
const BxPackedXmmRegister *reg = &BX_READ_AVX_REG_LANE(index, 1);
if (! is_clear(reg)) return true;
}
return false;