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52 lines
1.2 KiB
ArmAsm
52 lines
1.2 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS system libraries
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* PURPOSE: Implementation of tan
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* FILE: lib/sdk/crt/math/amd64/ceilf.S
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* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <asm.inc>
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#include <ksamd64.inc>
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/* CODE **********************************************************************/
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.code64
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PUBLIC ceilf
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FUNC ceilf
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sub rsp, 16
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.ENDPROLOG
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/* Duplicate the bits into eax (zero exteneded to rax) */
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movd eax, xmm0
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/* Invert the sign bit */
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xor eax, HEX(80000000)
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/* Copy back to xmm0 */
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movd xmm0, eax
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/* Truncate xmm0 to integer (single precision) */
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cvttss2si rcx, xmm0
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/* Shift all bits to the right, keeping the sign bit */
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shr rax, 31
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/* Add the sign bit from the truncated value, so that
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we get the correct result for negative values. */
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add rcx, rax
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/* Now compensate for the previous negation */
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neg ecx
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/* Convert the result back to xmm0 (single precision) */
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cvtsi2ss xmm0, rcx
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add rsp, 16
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ret
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ENDFUNC
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END
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