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x64: Begin migrating branch instructions to ISLE (#4587)

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https://github.com/bytecodealliance/wasmtime/pull/4587
This commit is contained in:
Trevor Elliott
2022-08-03 13:28:52 -07:00
committed by GitHub
parent b9dd48e34b
commit 301be7438e
4 changed files with 135 additions and 58 deletions
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32
cranelift/codegen/src/isa/x64/lower.isle
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@@ -4,6 +4,11 @@
;; register(s) within which the lowered instruction's result values live.
(decl lower (Inst) InstOutput)
;; A variant of the main lowering constructor term, used for branches.
;; The only difference is that it gets an extra argument holding a vector
;; of branch targets to be used.
(decl lower_branch (Inst MachLabelSlice) InstOutput)
;;;; Rules for `iconst` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; `i64` and smaller.
@@ -2856,3 +2861,30 @@
(x64_load $I64
(Amode.ImmReg 8 (preg_rbp) (mem_flags_trusted))
(ExtKind.None)))
;; Rules for `jump` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower_branch (jump _ _) (single_target target))
(side_effect (jmp_known target)))
;; Rules for `brif` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower_branch (brif cc (ifcmp a b) _ _) (two_targets taken not_taken))
(side_effect (jmp_cond_icmp (emit_cmp cc a b) taken not_taken)))
;; Rules for `brz` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower_branch (brz (icmp cc a b) _ _) (two_targets taken not_taken))
(let ((cmp IcmpCondResult (invert_icmp_cond_result (emit_cmp cc a b))))
(side_effect (jmp_cond_icmp cmp taken not_taken))))
;; Rules for `brnz` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower_branch (brnz (icmp cc a b) _ _) (two_targets taken not_taken))
(side_effect (jmp_cond_icmp (emit_cmp cc a b) taken not_taken)))
;; Rules for `bricmp` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower_branch (br_icmp cc a b _ _) (two_targets taken not_taken))
(side_effect (jmp_cond_icmp (emit_cmp cc a b) taken not_taken)))