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      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 __floatdixf(di_int a);
      7 
      8 #ifdef __i386__
      9 
     10 // This routine has some extra memory traffic, loading the 64-bit input via two
     11 // 32-bit loads, then immediately storing it back to the stack via a single 64-bit
     12 // store.  This is to avoid a write-small, read-large stall.
     13 // However, if callers of this routine can be safely assumed to store the argument
     14 // via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
     15 // It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.
     16 
     17 .text
     18 .balign 4
     19 DEFINE_COMPILERRT_FUNCTION(__floatdixf)
     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 	ret
     28 END_COMPILERRT_FUNCTION(__floatdixf)
     29 
     30 #endif // __i386__
     31