| Howard Hinnant | 5b791f6 | 2010-11-16 22:13:33 +0000 | [diff] [blame^] | 1 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 2 | // Source Licenses. See LICENSE.TXT for details. |
| Daniel Dunbar | fd08999 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 3 | |
| Daniel Dunbar | 7d50478 | 2009-10-27 17:49:50 +0000 | [diff] [blame] | 4 | #include "../assembly.h" |
| 5 | |
| Daniel Dunbar | fd08999 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 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 | .align 4 |
| Daniel Dunbar | 9ff9371 | 2009-10-27 17:50:21 +0000 | [diff] [blame] | 19 | DEFINE_COMPILERRT_FUNCTION(__floatdixf) |
| Daniel Dunbar | fd08999 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 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 | |
| Edward O'Callaghan | 8f40ca3 | 2009-11-04 23:52:51 +0000 | [diff] [blame] | 29 | #endif // __i386__ |