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cranelift: Implement scalar FMA on x86 (#4460)

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x86 does not have dedicated instructions for scalar FMA, lower
to a libcall which seems to be what llvm does.
This commit is contained in:
Afonso Bordado
2022-08-03 18:29:10 +01:00
committed by GitHub
parent ff6082c0af
commit 709716bb8e
13 changed files with 167 additions and 50 deletions
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4
cranelift/codegen/src/isa/x64/lower.isle
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@@ -2491,6 +2491,10 @@
;; Rules for `fma` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(rule (lower (has_type $F32 (fma x y z)))
(libcall_3 (LibCall.FmaF32) x y z))
(rule (lower (has_type $F64 (fma x y z)))
(libcall_3 (LibCall.FmaF64) x y z))
(rule (lower (has_type $F32X4 (fma x y z)))
(x64_vfmadd213ps x y z))
(rule (lower (has_type $F64X2 (fma x y z)))