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--- Libc/Libc-262.2.12/ppc/gen/bzero.s
+++ Libc/Libc-320/ppc/gen/bzero.s
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
@@ -22,82 +22,6 @@
*
* @APPLE_LICENSE_HEADER_END@
*/
-
-#define __APPLE_API_PRIVATE
-#include <machine/cpu_capabilities.h>
-#undef __APPLE_API_PRIVATE
-
-// Bzero has migrated to the comm page.
-
- .text
- .globl _bzero
- .globl _memset
-
- .align 5
-_bzero: // void bzero(void *b, size_t len);
- ba _COMM_PAGE_BZERO
-
- .align 5
-_memset: // void * memset(void *b, int c, size_t len);
- andi. r9,r4,0xFF // copy "c" and test for 0
- mr r4,r5 // move length down to where bzero() expects it
- beqa++ _COMM_PAGE_BZERO // c==0, so treat like bzero()
-
-// The nonzero memset() case is uncommon.
-
- cmplwi r5,8 // too short to align?
- rlwimi r9,r9,8,16,23 // replicate c to all 4 bytes
- neg r7,r3 // start to compute #bytes to word align
- mr r8,r3 // copy ptr so we can preserve r3
- rlwimi r9,r9,16,0,15
- blt 4f // fewer than 8 bytes
- andi. r0,r7,3 // get #bytes to word align
- mtcrf 0x01,r7 // set up #bytes to word align
- sub r5,r5,r0 // adjust length for word alignment
- srwi r6,r5,3 // get #8-byte chunks to memset()
- cmplwi cr1,r6,0 // any chunks?
- mtctr r6
- beq 3f // already word aligned (r6!=0)
-
- bf 31,1f // odd byte?
- stb r9,0(r8)
- addi r8,r8,1
-1:
- bf 30,2f // halfword?
- sth r9,0(r8)
- addi r8,r8,2
-2:
- bne cr1,3f // handle 8-byte chunks
- b 4f // no chunks
-
- .align 5
-3:
- stw r9,0(r8)
- stw r9,4(r8)
- addi r8,r8,8
- bdnz 3b
-
-// Store up to 8 leftover bytes.
-// r9 = value in all 4 bytes
-// r8 = ptr
-// r5 = length
-
-4:
- mtcrf 0x01,r5 // move remaining length to cr7
- bf 29,6f
- stw r9,0(r8)
- addi r8,r8,4
-6:
- bf 30,7f
- sth r9,0(r8)
- addi r8,r8,2
-7:
- bflr 31
- stb r9,0(r8)
- blr
-
-
-#if 0
//
// =============================
// BZERO and MEMSET FOR Mac OS X
@@ -118,6 +42,9 @@
#define rp r11
#define rv r10
+#define __APPLE_API_PRIVATE
+#include <machine/cpu_capabilities.h>
+
#include <architecture/ppc/asm_help.h>
.text
@@ -130,84 +57,36 @@
// *************
_bzero: // void bzero(void *b, size_t len);
- 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
+ ba _COMM_PAGE_BZERO
+
+ // 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 30,2f
- sth rv,0(rp)
- addi rp,rp,2
+ 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
+ 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
+ bf 30,4f
+ sth rv,0(rp)
+ addi rp,rp,2
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
-3:
- 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
@@ -220,7 +99,7 @@
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 ?
- beq Lbzero1 // memset of 0 is just a bzero
+ beqa++ _COMM_PAGE_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
@@ -278,5 +157,4 @@
5:
bflr 31
stb rv,0(rp)
- blr
-#endif /* 0 */
+ blr