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YJIT: Branch directly when truthyness is known

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This commit is contained in:
John Hawthorn 2022-09-05 15:20:08 -07:00
parent 79f50b9d02
commit d319184390
Notes: git 2022-09-10 12:30:03 +09:00 
Merged: https://github.com/ruby/ruby/pull/6350
1 changed files with 51 additions and 37 deletions
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40
yjit/src/codegen.rs
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@ -3197,12 +3197,6 @@ fn gen_branchif(
gen_check_ints(asm, side_exit);
}
// Test if any bit (outside of the Qnil bit) is on
// RUBY_Qfalse /* ...0000 0000 */
// RUBY_Qnil /* ...0000 1000 */
let val_opnd = ctx.stack_pop(1);
asm.test(val_opnd, Opnd::Imm(!Qnil.as_i64()));
// Get the branch target instruction offsets
let next_idx = jit_next_insn_idx(jit);
let jump_idx = (next_idx as i32) + jump_offset;
@ -3215,6 +3209,18 @@ fn gen_branchif(
idx: jump_idx as u32,
};
// Test if any bit (outside of the Qnil bit) is on
// RUBY_Qfalse /* ...0000 0000 */
// RUBY_Qnil /* ...0000 1000 */
let val_type = ctx.get_opnd_type(StackOpnd(0));
let val_opnd = ctx.stack_pop(1);
if let Some(result) = val_type.known_truthy() {
let target = if result { jump_block } else { next_block };
gen_direct_jump(jit, ctx, target, asm);
} else {
asm.test(val_opnd.into(), Opnd::Imm(!Qnil.as_i64()));
// Generate the branch instructions
gen_branch(
jit,
@ -3227,6 +3233,7 @@ fn gen_branchif(
Some(ctx),
gen_branchif_branch,
);
}
EndBlock
}
@ -3261,13 +3268,6 @@ fn gen_branchunless(
gen_check_ints(asm, side_exit);
}
// Test if any bit (outside of the Qnil bit) is on
// RUBY_Qfalse /* ...0000 0000 */
// RUBY_Qnil /* ...0000 1000 */
let val_opnd = ctx.stack_pop(1);
let not_qnil = !Qnil.as_i64();
asm.test(val_opnd, not_qnil.into());
// Get the branch target instruction offsets
let next_idx = jit_next_insn_idx(jit) as i32;
let jump_idx = next_idx + jump_offset;
@ -3280,6 +3280,19 @@ fn gen_branchunless(
idx: jump_idx.try_into().unwrap(),
};
let val_type = ctx.get_opnd_type(StackOpnd(0));
let val_opnd = ctx.stack_pop(1);
if let Some(result) = val_type.known_truthy() {
let target = if result { next_block } else { jump_block };
gen_direct_jump(jit, ctx, target, asm);
} else {
// Test if any bit (outside of the Qnil bit) is on
// RUBY_Qfalse /* ...0000 0000 */
// RUBY_Qnil /* ...0000 1000 */
let not_qnil = !Qnil.as_i64();
asm.test(val_opnd.into(), not_qnil.into());
// Generate the branch instructions
gen_branch(
jit,
@ -3292,6 +3305,7 @@ fn gen_branchunless(
Some(ctx),
gen_branchunless_branch,
);
}
EndBlock
}