cranelift: Implement scalar FMA on x86 (#4460)

x86 does not have dedicated instructions for scalar FMA, lower to a libcall which seems to be what llvm does.
2022-08-03 18:29:10 +01:00
parent ff6082c0af
commit 709716bb8e
13 changed files with 167 additions and 50 deletions
--- a/cranelift/codegen/src/isa/x64/inst.isle
+++ b/cranelift/codegen/src/isa/x64/inst.isle
@@ -3354,3 +3354,13 @@
 (decl x64_rsp () Reg)
 (rule (x64_rsp)
      (mov_preg (preg_rsp)))
+
+;;;; Helpers for Emitting LibCalls ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(type LibCall extern
+      (enum
+        FmaF32
+        FmaF64))
+
+(decl libcall_3 (LibCall Reg Reg Reg) Reg)
+(extern constructor libcall_3 libcall_3)