| 1 | //===-- truncdfsf2vfp.S - Implement truncdfsf2vfp -------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "../assembly.h" |
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| 10 | |
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| 11 | // |
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| 12 | // extern float __truncdfsf2vfp(double a); |
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| 13 | // |
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| 14 | // Converts double precision float to single precision result. |
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| 15 | // Uses Darwin calling convention where a double precision parameter is |
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| 16 | // passed in a R0/R1 pair and a single precision result is returned in R0. |
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| 17 | // |
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| 18 | .syntax unified |
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| 19 | .p2align 2 |
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| 20 | DEFINE_COMPILERRT_FUNCTION(__truncdfsf2vfp) |
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| 21 | #if defined(COMPILER_RT_ARMHF_TARGET) |
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| 22 | vcvt.f32.f64 s0, d0 |
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| 23 | #else |
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| 24 | vmov d7, r0, r1 // load double from r0/r1 pair |
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| 25 | vcvt.f32.f64 s15, d7 // convert double to single (trucate precision) |
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| 26 | vmov r0, s15 // return result in r0 |
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| 27 | #endif |
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| 28 | bx lr |
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| 29 | END_COMPILERRT_FUNCTION(__truncdfsf2vfp) |
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| 30 | |
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| 31 | NO_EXEC_STACK_DIRECTIVE |
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| 32 | |
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| 33 | |
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