Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...

[pandora-kernel.git] / arch / arm / lib / memset.S

diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S
index 95b110b..b477d4a 100644 (file)
--- a/arch/arm/lib/memset.S
+++ b/arch/arm/lib/memset.S
@@ -39,6 +39,9 @@ ENTRY(memset)
        mov     r3, r1
        cmp     r2, #16
        blt     4f
+
+#if ! CALGN(1)+0
+
 /*
  * We need an extra register for this loop - save the return address and
  * use the LR
@@ -64,6 +67,49 @@ ENTRY(memset)
        stmneia r0!, {r1, r3, ip, lr}
        ldr     lr, [sp], #4
 
+#else
+
+/*
+ * This version aligns the destination pointer in order to write
+ * whole cache lines at once.
+ */
+
+       stmfd   sp!, {r4-r7, lr}
+       mov     r4, r1
+       mov     r5, r1
+       mov     r6, r1
+       mov     r7, r1
+       mov     ip, r1
+       mov     lr, r1
+
+       cmp     r2, #96
+       tstgt   r0, #31
+       ble     3f
+
+       and     ip, r0, #31
+       rsb     ip, ip, #32
+       sub     r2, r2, ip
+       movs    ip, ip, lsl #(32 - 4)
+       stmcsia r0!, {r4, r5, r6, r7}
+       stmmiia r0!, {r4, r5}
+       tst     ip, #(1 << 30)
+       mov     ip, r1
+       strne   r1, [r0], #4
+
+3:     subs    r2, r2, #64
+       stmgeia r0!, {r1, r3-r7, ip, lr}
+       stmgeia r0!, {r1, r3-r7, ip, lr}
+       bgt     3b
+       ldmeqfd sp!, {r4-r7, pc}
+
+       tst     r2, #32
+       stmneia r0!, {r1, r3-r7, ip, lr}
+       tst     r2, #16
+       stmneia r0!, {r4-r7}
+       ldmfd   sp!, {r4-r7, lr}
+
+#endif
+
 4:     tst     r2, #8
        stmneia r0!, {r1, r3}
        tst     r2, #4