1 // This file is dual licensed under the MIT and the University of Illinois Open
2 // Source Licenses. See LICENSE.TXT for details.
4 #include "../assembly.h"
6 // float __floatdixf(di_int a);
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.
19 DEFINE_COMPILERRT_FUNCTION(__floatdixf)
20 #ifndef TRUST_CALLERS_USE_64_BIT_STORES
23 punpckldq %xmm1, %xmm0
28 END_COMPILERRT_FUNCTION(__floatdixf)