derek.holloway
7502bf64a4
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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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