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81 lines
1.3 KiB
ArmAsm
81 lines
1.3 KiB
ArmAsm
/*
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* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
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* PROJECT: ReactOS CRT library
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* PURPOSE: Implementation of __rt_srsh
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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 <kxarm.h>
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/* CODE **********************************************************************/
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TEXTAREA
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/*
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__int64
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__rt_srsh(
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__int64 value,
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uint32_t shift);
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R0 = loword of value
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R1 = hiword of value
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R2 = shift
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*/
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LEAF_ENTRY __rt_srsh
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/* r3 = 32 - r2 */
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rsbs r3, r2, #32
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/* Branch if minus (r2 > 32) */
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bmi __rt_srsh2
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/* r0 = r0 >> r2 (logical shift!) */
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lsr r0, r0, r2
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/* r3 = r1 << r3 */
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lsl r3, r1, r3
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/* r0 |= r1 << (32 - r2) */
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orr r0, r0, r3
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/* r1 = r1 >> r2 (arithmetic shift!) */
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asr r1, r1, r2
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bx lr
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__rt_srsh2
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/* Check if shift is > 64 */
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cmp r2, 64
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bhs __rt_srsh3
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/* r3 = r2 - 32 */
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sub r3, r2, #32
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/* r0 = r1 >> r3 (arithmetic shift!) */
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asr r0, r1, r3
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/* r1 = r1 >> 32 (arithmetic shift!) */
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asr r1, r1, #32
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bx lr
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__rt_srsh3
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/* r1 = r1 >> 32 (arithmetic shift!) */
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asr r1, r1, #32
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/* r0 = r1 */
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mov r0, r1
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bx lr
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LEAF_END __rt_srsh
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END
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/* EOF */
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