177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// This file is distributed under the University of Illinois Open Source 277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// License. See LICENSE.TXT for details. 377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#include "../assembly.h" 577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// float __floatdisf(di_int a); 777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// This routine has some extra memory traffic, loading the 64-bit input via two 977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// 32-bit loads, then immediately storing it back to the stack via a single 64-bit 1077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// store. This is to avoid a write-small, read-large stall. 1177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// However, if callers of this routine can be safely assumed to store the argument 1277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// via a 64-bt store, this is unnecessary memory traffic, and should be avoided. 1377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. 1477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#ifdef __i386__ 1677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao.text 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao.align 4 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei LiaoDEFINE_COMPILERRT_FUNCTION(__floatdisf) 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#ifndef TRUST_CALLERS_USE_64_BIT_STORES 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao movd 4(%esp), %xmm0 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao movd 8(%esp), %xmm1 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao punpckldq %xmm1, %xmm0 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao movq %xmm0, 4(%esp) 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#endif 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao fildll 4(%esp) 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao fstps 4(%esp) 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao flds 4(%esp) 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao ret 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#endif // __i386__ 32