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Check for comptime fixnum in gen_fixnum_cmp

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John Hawthorn 2021-09-14 08:58:05 -07:00 committed by Alan Wu
parent f1b7568f5a
commit 7d99e85601
1 changed files with 34 additions and 21 deletions
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55
yjit_codegen.c
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@ -1880,33 +1880,46 @@ typedef void (*cmov_fn)(codeblock_t* cb, x86opnd_t opnd0, x86opnd_t opnd1);
static codegen_status_t
gen_fixnum_cmp(jitstate_t* jit, ctx_t* ctx, cmov_fn cmov_op)
{
// Create a size-exit to fall back to the interpreter
// Note: we generate the side-exit before popping operands from the stack
uint8_t* side_exit = yjit_side_exit(jit, ctx);
if (!assume_bop_not_redefined(jit->block, INTEGER_REDEFINED_OP_FLAG, BOP_LT)) {
return YJIT_CANT_COMPILE;
// Defer compilation so we can specialize base on a runtime receiver
if (!jit_at_current_insn(jit)) {
defer_compilation(jit->block, jit->insn_idx, ctx);
return YJIT_END_BLOCK;
}
// Check that both operands are fixnums
guard_two_fixnums(ctx, side_exit);
VALUE comptime_a = jit_peek_at_stack(jit, ctx, 1);
VALUE comptime_b = jit_peek_at_stack(jit, ctx, 0);
// Get the operands from the stack
x86opnd_t arg1 = ctx_stack_pop(ctx, 1);
x86opnd_t arg0 = ctx_stack_pop(ctx, 1);
if (FIXNUM_P(comptime_a) && FIXNUM_P(comptime_b)) {
// Create a size-exit to fall back to the interpreter
// Note: we generate the side-exit before popping operands from the stack
uint8_t* side_exit = yjit_side_exit(jit, ctx);
// Compare the arguments
xor(cb, REG0_32, REG0_32); // REG0 = Qfalse
mov(cb, REG1, arg0);
cmp(cb, REG1, arg1);
mov(cb, REG1, imm_opnd(Qtrue));
cmov_op(cb, REG0, REG1);
if (!assume_bop_not_redefined(jit->block, INTEGER_REDEFINED_OP_FLAG, BOP_LT)) {
return YJIT_CANT_COMPILE;
}
// Push the output on the stack
x86opnd_t dst = ctx_stack_push(ctx, TYPE_UNKNOWN);
mov(cb, dst, REG0);
// Check that both operands are fixnums
guard_two_fixnums(ctx, side_exit);
return YJIT_KEEP_COMPILING;
// Get the operands from the stack
x86opnd_t arg1 = ctx_stack_pop(ctx, 1);
x86opnd_t arg0 = ctx_stack_pop(ctx, 1);
// Compare the arguments
xor(cb, REG0_32, REG0_32); // REG0 = Qfalse
mov(cb, REG1, arg0);
cmp(cb, REG1, arg1);
mov(cb, REG1, imm_opnd(Qtrue));
cmov_op(cb, REG0, REG1);
// Push the output on the stack
x86opnd_t dst = ctx_stack_push(ctx, TYPE_UNKNOWN);
mov(cb, dst, REG0);
return YJIT_KEEP_COMPILING;
} else {
return gen_opt_send_without_block(jit, ctx);
}
}
static codegen_status_t