05a4212cc7
Use of long double can be error-prone since it could be one of 80-bit extended precision float, IEEE 128-bit float, or IBM 128-bit float. Instead use an explicit xf_float typedef for the remaining cases where long double is being used in the implementation. This patch does not touch the PPC specializations which still use long double.
73 lines
1.5 KiB
ArmAsm
73 lines
1.5 KiB
ArmAsm
// 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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#include "../assembly.h"
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// xf_float __floatundixf(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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twop64:
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.quad 0x43f0000000000000
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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(__floatundixf)
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movq %rdi, -8(%rsp)
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fildq -8(%rsp)
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test %rdi, %rdi
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js 1f
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ret
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1: faddl REL_ADDR(twop64)
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ret
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END_COMPILERRT_FUNCTION(__floatundixf)
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#endif // __x86_64__
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/* Branch-free implementation is ever so slightly slower, but more beautiful.
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It is likely superior for inlining, so I kept it around for future reference.
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#ifdef __x86_64__
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CONST_SECTION
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.balign 4
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twop52:
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.quad 0x4330000000000000
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twop84_plus_twop52_neg:
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.quad 0xc530000000100000
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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(__floatundixf)
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movl %edi, %esi // low 32 bits of input
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shrq $32, %rdi // hi 32 bits of input
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orq REL_ADDR(twop84), %rdi // 2^84 + hi (as a double)
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orq REL_ADDR(twop52), %rsi // 2^52 + lo (as a double)
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movq %rdi, -8(%rsp)
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movq %rsi, -16(%rsp)
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fldl REL_ADDR(twop84_plus_twop52_neg)
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faddl -8(%rsp) // hi - 2^52 (as double extended, no rounding occurs)
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faddl -16(%rsp) // hi + lo (as double extended)
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ret
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END_COMPILERRT_FUNCTION(__floatundixf)
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#endif // __x86_64__
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*/
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NO_EXEC_STACK_DIRECTIVE
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