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previous_ip optimisation

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This commit is contained in:
Fabian 2020-12-31 19:14:33 -06:00
parent 0b80ef9448
commit 4035c0fb04
1 changed files with 11 additions and 4 deletions
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15
src/rust/jit.rs
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@ -1568,6 +1568,11 @@ fn jit_generate_module(
}
fn jit_generate_basic_block(ctx: &mut JitContext, block: &BasicBlock) {
let needs_previous_ip_updated = match block.ty {
BasicBlockType::Exit => true,
_ => false,
};
profiler::stat_increment(stat::COMPILE_BASIC_BLOCK);
let start_addr = block.addr;
@ -1597,10 +1602,12 @@ fn jit_generate_basic_block(ctx: &mut JitContext, block: &BasicBlock) {
// Before the last instruction:
// - Set eip to *after* the instruction
// - Set previous_eip to *before* the instruction
codegen::gen_set_previous_eip_offset_from_eip(
ctx.builder,
last_instruction_addr - start_addr,
);
if needs_previous_ip_updated {
codegen::gen_set_previous_eip_offset_from_eip(
ctx.builder,
last_instruction_addr - start_addr,
);
}
codegen::gen_increment_instruction_pointer(ctx.builder, stop_addr - start_addr);
}