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Optimise cr0 access in task_switch_test (only low byte needed)

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This commit is contained in:
Fabian 2020-12-31 19:14:29 -06:00
parent d2c01c31a3
commit c47b4b252c
3 changed files with 6 additions and 4 deletions
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6
src/rust/codegen.rs
View file

@ -1072,7 +1072,8 @@ pub fn gen_task_switch_test(ctx: &mut JitContext) {
// generate if(cr[0] & (CR0_EM | CR0_TS)) { task_switch_test_void(); return; }
let cr0_offset = global_pointers::get_creg_offset(0);
ctx.builder.instruction_body.load_aligned_i32(cr0_offset);
dbg_assert!(regs::CR0_EM | regs::CR0_TS <= 0xFF);
ctx.builder.instruction_body.load_u8(cr0_offset);
ctx.builder
.instruction_body
.const_i32((regs::CR0_EM | regs::CR0_TS) as i32);
@ -1094,7 +1095,8 @@ pub fn gen_task_switch_test_mmx(ctx: &mut JitContext) {
// generate if(cr[0] & (CR0_EM | CR0_TS)) { task_switch_test_mmx_void(); return; }
let cr0_offset = global_pointers::get_creg_offset(0);
ctx.builder.instruction_body.load_aligned_i32(cr0_offset);
dbg_assert!(regs::CR0_EM | regs::CR0_TS <= 0xFF);
ctx.builder.instruction_body.load_u8(cr0_offset);
ctx.builder
.instruction_body
.const_i32((regs::CR0_EM | regs::CR0_TS) as i32);

2
tests/expect/tests/task_switch_test.wast
View file

@ -93,7 +93,7 @@
(get_local $l0)))
(if $I5
(i32.and
(i32.load
(i32.load8_u
(i32.const 580))
(i32.const 12))
(then

2
tests/expect/tests/task_switch_test_sse.wast
View file

@ -108,7 +108,7 @@
(i32.const 32)))
(if $I6
(i32.and
(i32.load
(i32.load8_u
(i32.const 580))
(i32.const 12))
(then