1 // This file is dual licensed under the MIT and the University of Illinois Open 2 // Source Licenses. See LICENSE.TXT for details. 3 4 #include "../assembly.h" 5 6 // float __floatdisf(di_int a); 7 8 // This routine has some extra memory traffic, loading the 64-bit input via two 9 // 32-bit loads, then immediately storing it back to the stack via a single 64-bit 10 // store. This is to avoid a write-small, read-large stall. 11 // However, if callers of this routine can be safely assumed to store the argument 12 // via a 64-bt store, this is unnecessary memory traffic, and should be avoided. 13 // It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. 14 15 #ifdef __i386__ 16 17 .text 18 .align 4 19 DEFINE_COMPILERRT_FUNCTION(__floatdisf) 20 #ifndef TRUST_CALLERS_USE_64_BIT_STORES 21 movd 4(%esp), %xmm0 22 movd 8(%esp), %xmm1 23 punpckldq %xmm1, %xmm0 24 movq %xmm0, 4(%esp) 25 #endif 26 fildll 4(%esp) 27 fstps 4(%esp) 28 flds 4(%esp) 29 ret 30 31 #endif // __i386__ 32
