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1// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.2// See https://llvm.org/LICENSE.txt for license information.3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception4 5#include "../assembly.h"6 7// float __floatdisf(di_int a);8 9// This routine has some extra memory traffic, loading the 64-bit input via two10// 32-bit loads, then immediately storing it back to the stack via a single 64-bit11// store. This is to avoid a write-small, read-large stall.12// However, if callers of this routine can be safely assumed to store the argument13// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.14// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.15 16#ifdef __i386__17 18.text19.balign 420DEFINE_COMPILERRT_FUNCTION(__floatdisf)21#ifndef TRUST_CALLERS_USE_64_BIT_STORES22 movd 4(%esp), %xmm023 movd 8(%esp), %xmm124 punpckldq %xmm1, %xmm025 movq %xmm0, 4(%esp)26#endif27 fildll 4(%esp)28 fstps 4(%esp)29 flds 4(%esp)30 ret31END_COMPILERRT_FUNCTION(__floatdisf)32 33#endif // __i386__34 35NO_EXEC_STACK_DIRECTIVE36 37