summaryrefslogtreecommitdiff
path: root/arch/arm/lib/_divsi3.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/lib/_divsi3.S')
-rw-r--r--arch/arm/lib/_divsi3.S143
1 files changed, 0 insertions, 143 deletions
diff --git a/arch/arm/lib/_divsi3.S b/arch/arm/lib/_divsi3.S
deleted file mode 100644
index c463c68..0000000
--- a/arch/arm/lib/_divsi3.S
+++ /dev/null
@@ -1,143 +0,0 @@
-#include <linux/linkage.h>
-
-.macro ARM_DIV_BODY dividend, divisor, result, curbit
-
-#if __LINUX_ARM_ARCH__ >= 5
-
- clz \curbit, \divisor
- clz \result, \dividend
- sub \result, \curbit, \result
- mov \curbit, #1
- mov \divisor, \divisor, lsl \result
- mov \curbit, \curbit, lsl \result
- mov \result, #0
-
-#else
-
- @ Initially shift the divisor left 3 bits if possible,
- @ set curbit accordingly. This allows for curbit to be located
- @ at the left end of each 4 bit nibbles in the division loop
- @ to save one loop in most cases.
- tst \divisor, #0xe0000000
- moveq \divisor, \divisor, lsl #3
- moveq \curbit, #8
- movne \curbit, #1
-
- @ Unless the divisor is very big, shift it up in multiples of
- @ four bits, since this is the amount of unwinding in the main
- @ division loop. Continue shifting until the divisor is
- @ larger than the dividend.
-1: cmp \divisor, #0x10000000
- cmplo \divisor, \dividend
- movlo \divisor, \divisor, lsl #4
- movlo \curbit, \curbit, lsl #4
- blo 1b
-
- @ For very big divisors, we must shift it a bit at a time, or
- @ we will be in danger of overflowing.
-1: cmp \divisor, #0x80000000
- cmplo \divisor, \dividend
- movlo \divisor, \divisor, lsl #1
- movlo \curbit, \curbit, lsl #1
- blo 1b
-
- mov \result, #0
-
-#endif
-
- @ Division loop
-1: cmp \dividend, \divisor
- subhs \dividend, \dividend, \divisor
- orrhs \result, \result, \curbit
- cmp \dividend, \divisor, lsr #1
- subhs \dividend, \dividend, \divisor, lsr #1
- orrhs \result, \result, \curbit, lsr #1
- cmp \dividend, \divisor, lsr #2
- subhs \dividend, \dividend, \divisor, lsr #2
- orrhs \result, \result, \curbit, lsr #2
- cmp \dividend, \divisor, lsr #3
- subhs \dividend, \dividend, \divisor, lsr #3
- orrhs \result, \result, \curbit, lsr #3
- cmp \dividend, #0 @ Early termination?
- movnes \curbit, \curbit, lsr #4 @ No, any more bits to do?
- movne \divisor, \divisor, lsr #4
- bne 1b
-
-.endm
-
-.macro ARM_DIV2_ORDER divisor, order
-
-#if __LINUX_ARM_ARCH__ >= 5
-
- clz \order, \divisor
- rsb \order, \order, #31
-
-#else
-
- cmp \divisor, #(1 << 16)
- movhs \divisor, \divisor, lsr #16
- movhs \order, #16
- movlo \order, #0
-
- cmp \divisor, #(1 << 8)
- movhs \divisor, \divisor, lsr #8
- addhs \order, \order, #8
-
- cmp \divisor, #(1 << 4)
- movhs \divisor, \divisor, lsr #4
- addhs \order, \order, #4
-
- cmp \divisor, #(1 << 2)
- addhi \order, \order, #3
- addls \order, \order, \divisor, lsr #1
-
-#endif
-
-.endm
-
- .align 5
-.globl __divsi3
-__divsi3:
-ENTRY(__aeabi_idiv)
- cmp r1, #0
- eor ip, r0, r1 @ save the sign of the result.
- beq Ldiv0
- rsbmi r1, r1, #0 @ loops below use unsigned.
- subs r2, r1, #1 @ division by 1 or -1 ?
- beq 10f
- movs r3, r0
- rsbmi r3, r0, #0 @ positive dividend value
- cmp r3, r1
- bls 11f
- tst r1, r2 @ divisor is power of 2 ?
- beq 12f
-
- ARM_DIV_BODY r3, r1, r0, r2
-
- cmp ip, #0
- rsbmi r0, r0, #0
- mov pc, lr
-
-10: teq ip, r0 @ same sign ?
- rsbmi r0, r0, #0
- mov pc, lr
-
-11: movlo r0, #0
- moveq r0, ip, asr #31
- orreq r0, r0, #1
- mov pc, lr
-
-12: ARM_DIV2_ORDER r1, r2
-
- cmp ip, #0
- mov r0, r3, lsr r2
- rsbmi r0, r0, #0
- mov pc, lr
-
-Ldiv0:
-
- str lr, [sp, #-4]!
- bl __div0
- mov r0, #0 @ About as wrong as it could be.
- ldr pc, [sp], #4
-ENDPROC(__aeabi_idiv)