From c674a32ab8ac535463021e655c91ba5283d5148d Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Fri, 1 May 2020 17:35:20 +0200
Subject: [PATCH] Implement f*_fast intrinsics

---
 src/intrinsics/mod.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/intrinsics/mod.rs b/src/intrinsics/mod.rs
index 98509847b83..58eed4c2f59 100644
--- a/src/intrinsics/mod.rs
+++ b/src/intrinsics/mod.rs
@@ -987,6 +987,18 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             let ret_val = CValue::const_val(fx, ret.layout(), 0);
             ret.write_cvalue(fx, ret_val);
         };
+
+        fadd_fast | fsub_fast | fmul_fast | fdiv_fast | frem_fast, (c x, c y) {
+            let res = crate::num::trans_float_binop(fx, match intrinsic {
+                "fadd_fast" => BinOp::Add,
+                "fsub_fast" => BinOp::Sub,
+                "fmul_fast" => BinOp::Mul,
+                "fdiv_fast" => BinOp::Div,
+                "frem_fast" => BinOp::Rem,
+                _ => unreachable!(),
+            }, x, y);
+            ret.write_cvalue(fx, res);
+        };
     }
 
     if let Some((_, dest)) = destination {