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; 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; +}