| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| |
| #include "../assembly.h" |
| |
| // float __floatdisf(di_int a); |
| |
| // This routine has some extra memory traffic, loading the 64-bit input via two |
| // 32-bit loads, then immediately storing it back to the stack via a single 64-bit |
| // store. This is to avoid a write-small, read-large stall. |
| // However, if callers of this routine can be safely assumed to store the argument |
| // via a 64-bt store, this is unnecessary memory traffic, and should be avoided. |
| // It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. |
| |
| #ifdef __i386__ |
| |
| .text |
| .align 4 |
| DEFINE_COMPILERRT_FUNCTION(__floatdisf) |
| #ifndef TRUST_CALLERS_USE_64_BIT_STORES |
| movd 4(%esp), %xmm0 |
| movd 8(%esp), %xmm1 |
| punpckldq %xmm1, %xmm0 |
| movq %xmm0, 4(%esp) |
| #endif |
| fildll 4(%esp) |
| fstps 4(%esp) |
| flds 4(%esp) |
| ret |
| |
| #endif // __i386__ |
