diff options
Diffstat (limited to 'arch/arm/lib/memzero.S')
| -rw-r--r-- | arch/arm/lib/memzero.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/lib/memzero.S b/arch/arm/lib/memzero.S index 3fbdef5f802a..a0e319a4c03f 100644 --- a/arch/arm/lib/memzero.S +++ b/arch/arm/lib/memzero.S @@ -21,7 +21,9 @@ 1: subs r1, r1, #4 @ 1 do we have enough blt 5f @ 1 bytes to align with? cmp r3, #2 @ 1 + it lt strltb r2, [r0], #1 @ 1 + it le strleb r2, [r0], #1 @ 1 strb r2, [r0], #1 @ 1 add r1, r1, r3 @ 1 (r1 = r1 - (4 - r3)) @@ -51,19 +53,23 @@ ENTRY(__memzero) mov lr, r2 @ 1 3: subs r1, r1, #64 @ 1 write 32 bytes out per loop + itttt ge stmgeia r0!, {r2, r3, ip, lr} @ 4 stmgeia r0!, {r2, r3, ip, lr} @ 4 stmgeia r0!, {r2, r3, ip, lr} @ 4 stmgeia r0!, {r2, r3, ip, lr} @ 4 bgt 3b @ 1 + it eq ldmeqfd sp!, {pc} @ 1/2 quick exit /* * No need to correct the count; we're only testing bits from now on */ tst r1, #32 @ 1 + itt ne stmneia r0!, {r2, r3, ip, lr} @ 4 stmneia r0!, {r2, r3, ip, lr} @ 4 tst r1, #16 @ 1 16 bytes or more? + it ne stmneia r0!, {r2, r3, ip, lr} @ 4 ldr lr, [sp], #4 @ 1 @@ -109,17 +115,21 @@ ENTRY(__memzero) #endif 4: tst r1, #8 @ 1 8 bytes or more? + it ne stmneia r0!, {r2, r3} @ 2 tst r1, #4 @ 1 4 bytes or more? + it ne strne r2, [r0], #4 @ 1 /* * When we get here, we've got less than 4 bytes to zero. We * may have an unaligned pointer as well. */ 5: tst r1, #2 @ 1 2 bytes or more? + itt ne strneb r2, [r0], #1 @ 1 strneb r2, [r0], #1 @ 1 tst r1, #1 @ 1 a byte left over + it ne strneb r2, [r0], #1 @ 1 mov pc, lr @ 1 ENDPROC(__memzero) |