RTL271_1/evrcc/dsp_arm/l_shr.s

.text
.align 4
.code 32
.global L_shr
.type L_shr, %function

L_shr:
	MOV		r2,r0
	CMP		r0,#0
	BEQ		END
	CMP		r1,#0
	BEQ		END
	BLT		L_SHIFT	
R_SHIFT:
	CMP		r1,#31
	BGT		UNDERFLOW

	ASR		r0,r0,r1
	B		END
L_SHIFT:
	SUB		r1,#1
	EOR		r1,r1,r1, ASR # 31

	CMP		r1,#31
	BGT		OVERFLOW

	LSL		r0,r0,r1
	CMP		r2,r0,ASR r1
	BEQ		END
	B		OVERFLOW

OVERFLOW:
	CMP		r2,#0
	MOVGT	r0,#0x7FFFFFFF
	MOVLT	r0,#0x80000000
	B		END

UNDERFLOW:
	CMP		r2,#0
	MOVGT	r0,#0
	MVNLT	r0,#0
	B		END
END:
	BX		lr