| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
|---|
| 2 | // See https://llvm.org/LICENSE.txt for license information. |
|---|
| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
|---|
| 4 | |
|---|
| 5 | #include "../assembly.h" |
|---|
| 6 | |
|---|
| 7 | // xf_float __floatdixf(di_int a); |
|---|
| 8 | |
|---|
| 9 | #ifdef __i386__ |
|---|
| 10 | |
|---|
| 11 | // This routine has some extra memory traffic, loading the 64-bit input via two |
|---|
| 12 | // 32-bit loads, then immediately storing it back to the stack via a single 64-bit |
|---|
| 13 | // store. This is to avoid a write-small, read-large stall. |
|---|
| 14 | // However, if callers of this routine can be safely assumed to store the argument |
|---|
| 15 | // via a 64-bt store, this is unnecessary memory traffic, and should be avoided. |
|---|
| 16 | // It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. |
|---|
| 17 | |
|---|
| 18 | .text |
|---|
| 19 | .balign 4 |
|---|
| 20 | DEFINE_COMPILERRT_FUNCTION(__floatdixf) |
|---|
| 21 | #ifndef TRUST_CALLERS_USE_64_BIT_STORES |
|---|
| 22 | movd 4(%esp), %xmm0 |
|---|
| 23 | movd 8(%esp), %xmm1 |
|---|
| 24 | punpckldq %xmm1, %xmm0 |
|---|
| 25 | movq %xmm0, 4(%esp) |
|---|
| 26 | #endif |
|---|
| 27 | fildll 4(%esp) |
|---|
| 28 | ret |
|---|
| 29 | END_COMPILERRT_FUNCTION(__floatdixf) |
|---|
| 30 | |
|---|
| 31 | #endif // __i386__ |
|---|
| 32 | |
|---|
| 33 | NO_EXEC_STACK_DIRECTIVE |
|---|
| 34 | |
|---|
| 35 | |
|---|
