mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
75 lines
1.5 KiB
ArmAsm
75 lines
1.5 KiB
ArmAsm
// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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#include "third_party/compiler_rt/assembly.h"
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// long double __floatundixf(du_int a);
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#ifdef __x86_64__
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.section .yoink
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nopl huge_compiler_rt_license(%rip)
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.previous
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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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