wasm: use primitive opcodes for fabs and sqrt

- Add new `WasmInstr` constructor `WasmSqrt` for sqrt, corresponding to
  primitivie operations in wasm.
- When lowering CallishMachOp, use `WasmAbs` and `WasmSqrt` for F32 and
  F64 fabs and sqrt.

(cherry picked from commit 64b0d4d0)

compiler/GHC/CmmToAsm/Wasm/Asm.hs

@@ -374,6 +374,7 @@ asmTellWasmInstr ty_word instr = case instr of
   WasmF32DemoteF64 -> asmTellLine "f32.demote_f64"
   WasmF64PromoteF32 -> asmTellLine "f64.promote_f32"
   WasmAbs ty -> asmTellLine $ asmFromWasmType ty <> ".abs"
+  WasmSqrt ty -> asmTellLine $ asmFromWasmType ty <> ".sqrt"
   WasmNeg ty -> asmTellLine $ asmFromWasmType ty <> ".neg"
   WasmMin ty -> asmTellLine $ asmFromWasmType ty <> ".min"
   WasmMax ty -> asmTellLine $ asmFromWasmType ty <> ".max"

compiler/GHC/CmmToAsm/Wasm/FromCmm.hs

@@ -1108,6 +1108,28 @@ lower_CMO_Un_Homo lbl op [reg] [x] = do
       x_instr `WasmConcat` WasmCCall op `WasmConcat` WasmLocalSet ty ri
 lower_CMO_Un_Homo _ _ _ _ = panic "lower_CMO_Un_Homo: unreachable"
 
+-- | Lower an unary homogeneous 'CallishMachOp' to a primitive operation.
+lower_CMO_Un_Homo_Prim ::
+  CLabel ->
+  ( forall pre t.
+    WasmTypeTag t ->
+    WasmInstr
+      w
+      (t : pre)
+      (t : pre)
+  ) ->
+  WasmTypeTag t ->
+  [CmmFormal] ->
+  [CmmActual] ->
+  WasmCodeGenM w (WasmStatements w)
+lower_CMO_Un_Homo_Prim lbl op ty [reg] [x] = do
+  (ri, _) <- onCmmLocalReg reg
+  WasmExpr x_instr <- lower_CmmExpr_Typed lbl ty x
+  pure $
+    WasmStatements $
+      x_instr `WasmConcat` op ty `WasmConcat` WasmLocalSet ty ri
+lower_CMO_Un_Homo_Prim _ _ _ _ _ = panic "lower_CMO_Bin_Homo_Prim: unreachable"
+
 -- | Lower a binary homogeneous 'CallishMachOp' to a ccall.
 lower_CMO_Bin_Homo ::
   CLabel ->
@@ -1211,8 +1233,8 @@ lower_CallishMachOp lbl MO_F64_Log rs xs = lower_CMO_Un_Homo lbl "log" rs xs
 lower_CallishMachOp lbl MO_F64_Log1P rs xs = lower_CMO_Un_Homo lbl "log1p" rs xs
 lower_CallishMachOp lbl MO_F64_Exp rs xs = lower_CMO_Un_Homo lbl "exp" rs xs
 lower_CallishMachOp lbl MO_F64_ExpM1 rs xs = lower_CMO_Un_Homo lbl "expm1" rs xs
-lower_CallishMachOp lbl MO_F64_Fabs rs xs = lower_CMO_Un_Homo lbl "fabs" rs xs
-lower_CallishMachOp lbl MO_F64_Sqrt rs xs = lower_CMO_Un_Homo lbl "sqrt" rs xs
+lower_CallishMachOp lbl MO_F64_Fabs rs xs = lower_CMO_Un_Homo_Prim lbl WasmAbs TagF64 rs xs
+lower_CallishMachOp lbl MO_F64_Sqrt rs xs = lower_CMO_Un_Homo_Prim lbl WasmSqrt TagF64 rs xs
 lower_CallishMachOp lbl MO_F32_Pwr rs xs = lower_CMO_Bin_Homo lbl "powf" rs xs
 lower_CallishMachOp lbl MO_F32_Sin rs xs = lower_CMO_Un_Homo lbl "sinf" rs xs
 lower_CallishMachOp lbl MO_F32_Cos rs xs = lower_CMO_Un_Homo lbl "cosf" rs xs
@@ -1235,8 +1257,8 @@ lower_CallishMachOp lbl MO_F32_Log1P rs xs =
 lower_CallishMachOp lbl MO_F32_Exp rs xs = lower_CMO_Un_Homo lbl "expf" rs xs
 lower_CallishMachOp lbl MO_F32_ExpM1 rs xs =
   lower_CMO_Un_Homo lbl "expm1f" rs xs
-lower_CallishMachOp lbl MO_F32_Fabs rs xs = lower_CMO_Un_Homo lbl "fabsf" rs xs
-lower_CallishMachOp lbl MO_F32_Sqrt rs xs = lower_CMO_Un_Homo lbl "sqrtf" rs xs
+lower_CallishMachOp lbl MO_F32_Fabs rs xs = lower_CMO_Un_Homo_Prim lbl WasmAbs TagF32 rs xs
+lower_CallishMachOp lbl MO_F32_Sqrt rs xs = lower_CMO_Un_Homo_Prim lbl WasmSqrt TagF32 rs xs
 lower_CallishMachOp lbl (MO_UF_Conv w0) rs xs = lower_MO_UF_Conv lbl w0 rs xs
 lower_CallishMachOp _ MO_AcquireFence _ _ = pure $ WasmStatements WasmNop
 lower_CallishMachOp _ MO_ReleaseFence _ _ = pure $ WasmStatements WasmNop

compiler/GHC/CmmToAsm/Wasm/Types.hs

@@ -310,6 +310,7 @@ data WasmInstr :: WasmType -> [WasmType] -> [WasmType] -> Type where
   WasmF32DemoteF64 :: WasmInstr w ('F64 : pre) ('F32 : pre)
   WasmF64PromoteF32 :: WasmInstr w ('F32 : pre) ('F64 : pre)
   WasmAbs :: WasmTypeTag t -> WasmInstr w (t : pre) (t : pre)
+  WasmSqrt :: WasmTypeTag t -> WasmInstr w (t : pre) (t : pre)
   WasmNeg :: WasmTypeTag t -> WasmInstr w (t : pre) (t : pre)
   WasmMin :: WasmTypeTag t -> WasmInstr w (t : t : pre) (t : pre)
   WasmMax :: WasmTypeTag t -> WasmInstr w (t : t : pre) (t : pre)