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cranelift: Remove brz and brnz (#5630)

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Remove the brz and brnz instructions, as their behavior is now redundant with brif.
This commit is contained in:
Trevor Elliott
2023-01-30 12:34:56 -08:00
committed by GitHub
parent 77cf547f41
commit a5698cedf8
247 changed files with 2947 additions and 3754 deletions
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35
cranelift/codegen/src/isa/x64/lower.isle
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@@ -2904,41 +2904,6 @@
(jmp_cond (CC.NZ) then else))))
;; Rules for `brz` and `brnz` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule 2 (lower_branch (brz (maybe_uextend (icmp cc a b)) _) (two_targets taken not_taken))
(let ((cmp IcmpCondResult (invert_icmp_cond_result (emit_cmp cc a b))))
(emit_side_effect (jmp_cond_icmp cmp taken not_taken))))
(rule 2 (lower_branch (brz (maybe_uextend (fcmp cc a b)) _) (two_targets taken not_taken))
(let ((cmp FcmpCondResult (emit_fcmp (floatcc_inverse cc) a b)))
(emit_side_effect (jmp_cond_fcmp cmp taken not_taken))))
(rule 1 (lower_branch (brz val @ (value_type $I128) _) (two_targets taken not_taken))
(emit_side_effect (jmp_cond_icmp (cmp_zero_i128 (CC.NZ) val) taken not_taken)))
(rule 0 (lower_branch (brz val @ (value_type (ty_int_bool_or_ref)) _) (two_targets taken not_taken))
(emit_side_effect
(with_flags_side_effect (cmp_zero_int_bool_ref val)
(jmp_cond (CC.Z) taken not_taken))))
(rule 2 (lower_branch (brnz (maybe_uextend (icmp cc a b)) _) (two_targets taken not_taken))
(emit_side_effect (jmp_cond_icmp (emit_cmp cc a b) taken not_taken)))
(rule 2 (lower_branch (brnz (maybe_uextend (fcmp cc a b)) _) (two_targets taken not_taken))
(let ((cmp FcmpCondResult (emit_fcmp cc a b)))
(emit_side_effect (jmp_cond_fcmp cmp taken not_taken))))
(rule 1 (lower_branch (brnz val @ (value_type $I128) _) (two_targets taken not_taken))
(emit_side_effect (jmp_cond_icmp (cmp_zero_i128 (CC.Z) val) taken not_taken)))
(rule 0 (lower_branch (brnz val @ (value_type (ty_int_bool_or_ref)) _) (two_targets taken not_taken))
(emit_side_effect
(with_flags_side_effect (cmp_zero_int_bool_ref val)
(jmp_cond (CC.NZ) taken not_taken))))
;; Compare an I128 value to zero, returning a flags result suitable for making a
;; jump decision. The comparison is implemented as `(hi == 0) && (low == 0)`,
;; and the result can be interpreted as follows