4466b20cfc
Adopted from the uClibc optimized string versions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
91 lines
1.9 KiB
ArmAsm
91 lines
1.9 KiB
ArmAsm
/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
|
|
/* Modified by SuperH, Inc. September 2003 */
|
|
!
|
|
! Fast SH memset
|
|
!
|
|
! by Toshiyasu Morita (tm@netcom.com)
|
|
!
|
|
! SH5 code by J"orn Rennecke (joern.rennecke@superh.com)
|
|
! Copyright 2002 SuperH Ltd.
|
|
!
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define SHHI shlld
|
|
#define SHLO shlrd
|
|
#else
|
|
#define SHHI shlrd
|
|
#define SHLO shlld
|
|
#endif
|
|
|
|
.section .text..SHmedia32,"ax"
|
|
.globl memset
|
|
.type memset, @function
|
|
|
|
.align 5
|
|
|
|
memset:
|
|
pta/l multiquad, tr0
|
|
andi r2, 7, r22
|
|
ptabs r18, tr2
|
|
mshflo.b r3,r3,r3
|
|
add r4, r22, r23
|
|
mperm.w r3, r63, r3 // Fill pattern now in every byte of r3
|
|
|
|
movi 8, r9
|
|
bgtu/u r23, r9, tr0 // multiquad
|
|
|
|
beqi/u r4, 0, tr2 // Return with size 0 - ensures no mem accesses
|
|
ldlo.q r2, 0, r7
|
|
shlli r4, 2, r4
|
|
movi -1, r8
|
|
SHHI r8, r4, r8
|
|
SHHI r8, r4, r8
|
|
mcmv r7, r8, r3
|
|
stlo.q r2, 0, r3
|
|
blink tr2, r63
|
|
|
|
multiquad:
|
|
pta/l lastquad, tr0
|
|
stlo.q r2, 0, r3
|
|
shlri r23, 3, r24
|
|
add r2, r4, r5
|
|
beqi/u r24, 1, tr0 // lastquad
|
|
pta/l loop, tr1
|
|
sub r2, r22, r25
|
|
andi r5, -8, r20 // calculate end address and
|
|
addi r20, -7*8, r8 // loop end address; This might overflow, so we need
|
|
// to use a different test before we start the loop
|
|
bge/u r24, r9, tr1 // loop
|
|
st.q r25, 8, r3
|
|
st.q r20, -8, r3
|
|
shlri r24, 1, r24
|
|
beqi/u r24, 1, tr0 // lastquad
|
|
st.q r25, 16, r3
|
|
st.q r20, -16, r3
|
|
beqi/u r24, 2, tr0 // lastquad
|
|
st.q r25, 24, r3
|
|
st.q r20, -24, r3
|
|
lastquad:
|
|
sthi.q r5, -1, r3
|
|
blink tr2,r63
|
|
|
|
loop:
|
|
!!! alloco r25, 32 // QQQ comment out for short-term fix to SHUK #3895.
|
|
// QQQ commenting out is locically correct, but sub-optimal
|
|
// QQQ Sean McGoogan - 4th April 2003.
|
|
st.q r25, 8, r3
|
|
st.q r25, 16, r3
|
|
st.q r25, 24, r3
|
|
st.q r25, 32, r3
|
|
addi r25, 32, r25
|
|
bgeu/l r8, r25, tr1 // loop
|
|
|
|
st.q r20, -40, r3
|
|
st.q r20, -32, r3
|
|
st.q r20, -24, r3
|
|
st.q r20, -16, r3
|
|
st.q r20, -8, r3
|
|
sthi.q r5, -1, r3
|
|
blink tr2,r63
|
|
|
|
.size memset,.-memset
|