derek.holloway
7502bf64a4
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52 lines
1.3 KiB
ArmAsm
52 lines
1.3 KiB
ArmAsm
//===-- floatundidf.S - Implement __floatundidf for x86_64 ----------------===//
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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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//
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// This file implements __floatundidf for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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// double __floatundidf(du_int a);
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#ifdef __x86_64__
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CONST_SECTION
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.balign 16
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twop52:
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.quad 0x4330000000000000
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.balign 16
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twop84_plus_twop52:
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.quad 0x4530000000100000
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.balign 16
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twop84:
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.quad 0x4530000000000000
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#define REL_ADDR(_a) (_a)(%rip)
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.text
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.balign 4
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DEFINE_COMPILERRT_FUNCTION(__floatundidf)
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movd %edi, %xmm0 // low 32 bits of a
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shrq $32, %rdi // high 32 bits of a
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orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs)
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orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs)
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movd %rdi, %xmm1
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subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs)
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addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here)
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ret
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END_COMPILERRT_FUNCTION(__floatundidf)
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#endif // __x86_64__
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NO_EXEC_STACK_DIRECTIVE
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