1 files changed, 181 insertions, 0 deletions

diff --git a/arch/alpha/lib/memmove.S b/arch/alpha/lib/memmove.S
new file mode 100644
index 000000000000..eb3b6e02242f
--- /dev/null
+++ b/arch/alpha/lib/memmove.S
@@ -0,0 +1,181 @@
+/*
+ * arch/alpha/lib/memmove.S
+ *
+ * Barely optimized memmove routine for Alpha EV5.
+ *
+ * This is hand-massaged output from the original memcpy.c.  We defer to
+ * memcpy whenever possible; the backwards copy loops are not unrolled.
+ */
+        
+        .set noat
+        .set noreorder
+        .text
+
+        .align 4
+        .globl memmove
+        .ent memmove
+memmove:
+        ldgp $29, 0($27)
+        unop
+        nop
+        .prologue 1
+
+        addq $16,$18,$4
+        addq $17,$18,$5
+        cmpule $4,$17,$1                /*  dest + n <= src  */
+        cmpule $5,$16,$2                /*  dest >= src + n  */
+
+        bis $1,$2,$1
+        mov $16,$0
+        xor $16,$17,$2
+        bne $1,memcpy                   !samegp
+
+        and $2,7,$2                     /* Test for src/dest co-alignment.  */
+        and $16,7,$1
+        cmpule $16,$17,$3
+        bne $3,$memmove_up              /* dest < src */
+
+        and $4,7,$1
+        bne $2,$misaligned_dn
+        unop
+        beq $1,$skip_aligned_byte_loop_head_dn
+
+$aligned_byte_loop_head_dn:
+        lda $4,-1($4)
+        lda $5,-1($5)
+        unop
+        ble $18,$egress
+
+        ldq_u $3,0($5)
+        ldq_u $2,0($4)
+        lda $18,-1($18)
+        extbl $3,$5,$1
+
+        insbl $1,$4,$1
+        mskbl $2,$4,$2
+        bis $1,$2,$1
+        and $4,7,$6
+
+        stq_u $1,0($4)
+        bne $6,$aligned_byte_loop_head_dn
+
+$skip_aligned_byte_loop_head_dn:
+        lda $18,-8($18)
+        blt $18,$skip_aligned_word_loop_dn
+
+$aligned_word_loop_dn:
+        ldq $1,-8($5)
+        nop
+        lda $5,-8($5)
+        lda $18,-8($18)
+
+        stq $1,-8($4)
+        nop
+        lda $4,-8($4)
+        bge $18,$aligned_word_loop_dn
+
+$skip_aligned_word_loop_dn:
+        lda $18,8($18)
+        bgt $18,$byte_loop_tail_dn
+        unop
+        ret $31,($26),1
+
+        .align 4
+$misaligned_dn:
+        nop
+        fnop
+        unop
+        beq $18,$egress
+
+$byte_loop_tail_dn:
+        ldq_u $3,-1($5)
+        ldq_u $2,-1($4)
+        lda $5,-1($5)
+        lda $4,-1($4)
+
+        lda $18,-1($18)
+        extbl $3,$5,$1
+        insbl $1,$4,$1
+        mskbl $2,$4,$2
+
+        bis $1,$2,$1
+        stq_u $1,0($4)
+        bgt $18,$byte_loop_tail_dn
+        br $egress
+
+$memmove_up:
+        mov $16,$4
+        mov $17,$5
+        bne $2,$misaligned_up
+        beq $1,$skip_aligned_byte_loop_head_up
+
+$aligned_byte_loop_head_up:
+        unop
+        ble $18,$egress
+        ldq_u $3,0($5)
+        ldq_u $2,0($4)
+
+        lda $18,-1($18)
+        extbl $3,$5,$1
+        insbl $1,$4,$1
+        mskbl $2,$4,$2
+
+        bis $1,$2,$1
+        lda $5,1($5)
+        stq_u $1,0($4)
+        lda $4,1($4)
+
+        and $4,7,$6
+        bne $6,$aligned_byte_loop_head_up
+
+$skip_aligned_byte_loop_head_up:
+        lda $18,-8($18)
+        blt $18,$skip_aligned_word_loop_up
+
+$aligned_word_loop_up:
+        ldq $1,0($5)
+        nop
+        lda $5,8($5)
+        lda $18,-8($18)
+
+        stq $1,0($4)
+        nop
+        lda $4,8($4)
+        bge $18,$aligned_word_loop_up
+
+$skip_aligned_word_loop_up:
+        lda $18,8($18)
+        bgt $18,$byte_loop_tail_up
+        unop
+        ret $31,($26),1
+
+        .align 4
+$misaligned_up:
+        nop
+        fnop
+        unop
+        beq $18,$egress
+
+$byte_loop_tail_up:
+        ldq_u $3,0($5)
+        ldq_u $2,0($4)
+        lda $18,-1($18)
+        extbl $3,$5,$1
+
+        insbl $1,$4,$1
+        mskbl $2,$4,$2
+        bis $1,$2,$1
+        stq_u $1,0($4)
+
+        lda $5,1($5)
+        lda $4,1($4)
+        nop
+        bgt $18,$byte_loop_tail_up
+
+$egress:
+        ret $31,($26),1
+        nop
+        nop
+        nop
+
+        .end memmove