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-exception 4 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 two 10// 32-bit loads, then immediately storing it back to the stack via a single 64-bit 11// 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 argument 13// 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.text 19.balign 4 20DEFINE_COMPILERRT_FUNCTION(__floatdisf) 21#ifndef TRUST_CALLERS_USE_64_BIT_STORES 22 movd 4(%esp), %xmm0 23 movd 8(%esp), %xmm1 24 punpckldq %xmm1, %xmm0 25 movq %xmm0, 4(%esp) 26#endif 27 fildll 4(%esp) 28 fstps 4(%esp) 29 flds 4(%esp) 30 ret 31END_COMPILERRT_FUNCTION(__floatdisf) 32 33#endif // __i386__ 34 35NO_EXEC_STACK_DIRECTIVE 36 37