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--- Libc/Libc-320.1.3/ppc/gen/bzero.s
+++ Libc/Libc-262/ppc/gen/bzero.s
@@ -3,20 +3,19 @@
*
* @APPLE_LICENSE_HEADER_START@
*
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
*
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
@@ -40,9 +39,6 @@
#define rp r11
#define rv r10
-#define __APPLE_API_PRIVATE
-#include <machine/cpu_capabilities.h>
-
#include <architecture/ppc/asm_help.h>
.text
@@ -55,36 +51,84 @@
// *************
_bzero: // void bzero(void *b, size_t len);
- ba _COMM_PAGE_BZERO
-
- // store up to 31 trailing bytes
- // rv = value to store (in all 4 bytes)
- // rc = #bytes to store (0..31)
+ cmplwi cr1,rc,32 // too short for DCBZ?
+ li rv,0 // get a 0
+Lbzero1: // enter from memset with cr1 and rv set up
+ neg r5,r3 // start to compute bytes to align
+ mr rp,r3 // make copy of operand ptr
+ andi. r6,r5,0x1F // r6 <- bytes to align on cache block
+ blt- cr1,Ltail // <32, so skip DCBZs
+ beq- cr0,Ldcbz // already aligned
+
+ // align on 32-byte boundary
+
+ mtcrf 0x01,r6 // move length to cr7 (faster if only 1 cr)
+ andi. r7,r6,16 // test bit 27 by hand
+ sub rc,rc,r6 // adjust length
+ bf 31,1f // test bits of count
+ stb rv,0(rp)
+ addi rp,rp,1
+1:
+ bf 30,2f
+ sth rv,0(rp)
+ addi rp,rp,2
+2:
+ bf 29,3f
+ stw rv,0(rp)
+ addi rp,rp,4
+3:
+ bf 28,4f
+ stw rv,0(rp)
+ stw rv,4(rp)
+ addi rp,rp,8
+4:
+ beq Ldcbz
+ stw rv,0(rp)
+ stw rv,4(rp)
+ stw rv,8(rp)
+ stw rv,12(rp)
+ addi rp,rp,16
+
+ // DCBZ 32-byte cache blocks
+Ldcbz:
+ srwi. r5,rc,5 // r5 <- number of cache blocks to zero
+ beq Ltail // none
+ mtctr r5 // set up loop count
+ andi. rc,rc,0x1F // will there be leftovers?
+1:
+ dcbz 0,rp // zero 32 bytes
+ addi rp,rp,32
+ bdnz 1b
+ beqlr // no leftovers so done
+
+ // store up to 31 trailing bytes
+ // rv = value to store (in all 4 bytes)
+ // rc = #bytes to store (0..31)
Ltail:
- andi. r5,rc,16 // bit 27 set in length?
- mtcrf 0x01,rc // low 4 bits of length to cr7
- beq 1f // test bits of length
- stw rv,0(rp)
- stw rv,4(rp)
- stw rv,8(rp)
- stw rv,12(rp)
- addi rp,rp,16
-1:
- bf 28,2f
- stw rv,0(rp)
- stw rv,4(rp)
- addi rp,rp,8
-2:
- bf 29,3f
- stw rv,0(rp)
- addi rp,rp,4
+ andi. r5,rc,16 // bit 27 set in length?
+ mtcrf 0x01,rc // low 4 bits of length to cr7
+ beq 1f // test bits of length
+ stw rv,0(rp)
+ stw rv,4(rp)
+ stw rv,8(rp)
+ stw rv,12(rp)
+ addi rp,rp,16
+1:
+ bf 28,2f
+ stw rv,0(rp)
+ stw rv,4(rp)
+ addi rp,rp,8
+2:
+ bf 29,3f
+ stw rv,0(rp)
+ addi rp,rp,4
3:
- bf 30,4f
- sth rv,0(rp)
- addi rp,rp,2
+ bf 30,4f
+ sth rv,0(rp)
+ addi rp,rp,2
4:
- bflr 31
- stb rv,0(rp)
+ bflr 31
+ stb rv,0(rp)
blr
@@ -97,7 +141,7 @@
andi. rv,r4,0xFF // copy value to working register, test for 0
mr rc,r5 // move length to working register
cmplwi cr1,r5,32 // length < 32 ?
- beqa++ _COMM_PAGE_BZERO
+ beq Lbzero1 // memset of 0 is just a bzero
rlwimi rv,rv,8,16,23 // replicate value to low 2 bytes
mr rp,r3 // make working copy of operand ptr
rlwimi rv,rv,16,0,15 // value now in all 4 bytes
@@ -155,4 +199,4 @@
5:
bflr 31
stb rv,0(rp)
- blr
+ blr