| 1 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 2 | // See https://llvm.org/LICENSE.txt for license information. |
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| 3 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 4 | |
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| 5 | #include "../assembly.h" |
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| 6 | |
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| 7 | // float __floatdisf(di_int a); |
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| 8 | |
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| 9 | // This routine has some extra memory traffic, loading the 64-bit input via two |
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| 10 | // 32-bit loads, then immediately storing it back to the stack via a single 64-bit |
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| 11 | // store. This is to avoid a write-small, read-large stall. |
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| 12 | // However, if callers of this routine can be safely assumed to store the argument |
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| 13 | // via a 64-bt store, this is unnecessary memory traffic, and should be avoided. |
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| 14 | // It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro. |
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| 15 | |
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| 16 | #ifdef __i386__ |
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| 17 | |
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| 18 | .text |
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| 19 | .balign 4 |
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| 20 | DEFINE_COMPILERRT_FUNCTION(__floatdisf) |
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| 21 | #ifndef TRUST_CALLERS_USE_64_BIT_STORES |
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| 22 | movd 4(%esp), %xmm0 |
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| 23 | movd 8(%esp), %xmm1 |
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| 24 | punpckldq %xmm1, %xmm0 |
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| 25 | movq %xmm0, 4(%esp) |
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| 26 | #endif |
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| 27 | fildll 4(%esp) |
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| 28 | fstps 4(%esp) |
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| 29 | flds 4(%esp) |
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| 30 | ret |
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| 31 | END_COMPILERRT_FUNCTION(__floatdisf) |
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| 32 | |
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| 33 | #endif // __i386__ |
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| 34 | |
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| 35 | NO_EXEC_STACK_DIRECTIVE |
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| 36 | |
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| 37 | |
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