[PATCH] D32301: Don't pass FPOpFusion::Strict to the backend

[Adam Nemet via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL300858: Don't pass FPOpFusion::Strict to the backend (authored by anemet).

Changed prior to commit:
  https://reviews.llvm.org/D32301?vs=95979&id=95982#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D32301

Files:
  cfe/trunk/lib/CodeGen/BackendUtil.cpp
  cfe/trunk/test/CodeGen/fp-contract-on-asm.c


Index: cfe/trunk/test/CodeGen/fp-contract-on-asm.c
===================================================================
--- cfe/trunk/test/CodeGen/fp-contract-on-asm.c
+++ cfe/trunk/test/CodeGen/fp-contract-on-asm.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -O3 -triple=aarch64-apple-ios -S -o - %s | FileCheck %s
+// REQUIRES: aarch64-registered-target
+
+float fma_test1(float a, float b, float c) {
+#pragma STDC FP_CONTRACT ON
+// CHECK-LABEL: fma_test1:
+// CHECK: fmadd
+  float x = a * b + c;
+  return x;
+}
+
+float fma_test2(float a, float b, float c) {
+// CHECK-LABEL: fma_test2:
+// CHECK: fmul
+// CHECK: fadd
+  float x = a * b + c;
+  return x;
+}
Index: cfe/trunk/lib/CodeGen/BackendUtil.cpp
===================================================================
--- cfe/trunk/lib/CodeGen/BackendUtil.cpp
+++ cfe/trunk/lib/CodeGen/BackendUtil.cpp
@@ -369,7 +369,9 @@
   // Set FP fusion mode.
   switch (LangOpts.getDefaultFPContractMode()) {
   case LangOptions::FPC_Off:
-    Options.AllowFPOpFusion = llvm::FPOpFusion::Strict;
+    // Preserve any contraction performed by the front-end.  (Strict performs
+    // splitting of the muladd instrinsic in the backend.)
+    Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
     break;
   case LangOptions::FPC_On:
     Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;


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