derek.holloway
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44 lines
1010 B
ArmAsm
44 lines
1010 B
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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// double __floatdidf(du_int a);
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#ifdef __i386__
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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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twop32:
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.quad 0x41f0000000000000
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#define REL_ADDR(_a) (_a)-0b(%eax)
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.text
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.balign 4
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DEFINE_COMPILERRT_FUNCTION(__floatdidf)
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cvtsi2sd 8(%esp), %xmm1
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movss 4(%esp), %xmm0 // low 32 bits of a
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calll 0f
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0: popl %eax
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mulsd REL_ADDR(twop32), %xmm1 // a_hi as a double (without rounding)
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movsd REL_ADDR(twop52), %xmm2 // 0x1.0p52
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subsd %xmm2, %xmm1 // a_hi - 0x1p52 (no rounding occurs)
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orpd %xmm2, %xmm0 // 0x1p52 + a_lo (no rounding occurs)
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addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here)
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movsd %xmm0, 4(%esp)
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fldl 4(%esp)
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ret
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END_COMPILERRT_FUNCTION(__floatdidf)
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#endif // __i386__
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NO_EXEC_STACK_DIRECTIVE
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