derek.holloway
7502bf64a4
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33 lines
1.1 KiB
ArmAsm
33 lines
1.1 KiB
ArmAsm
//===-- subdf3vfp.S - Implement subdf3vfp ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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//
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// extern double __subdf3vfp(double a, double b);
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//
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// Returns difference between two double precision floating point numbers using
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// the Darwin calling convention where double arguments are passsed in GPR pairs
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//
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.syntax unified
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__subdf3vfp)
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#if defined(COMPILER_RT_ARMHF_TARGET)
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vsub.f64 d0, d0, d1
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#else
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VMOV_TO_DOUBLE(d6, r0, r1) // move first param from r0/r1 pair into d6
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VMOV_TO_DOUBLE(d7, r2, r3) // move second param from r2/r3 pair into d7
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vsub.f64 d6, d6, d7
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VMOV_FROM_DOUBLE(r0, r1, d6) // move result back to r0/r1 pair
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#endif
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bx lr
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END_COMPILERRT_FUNCTION(__subdf3vfp)
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NO_EXEC_STACK_DIRECTIVE
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