You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
595 lines
18 KiB
595 lines
18 KiB
commit 92fdb11ae7aa1ab6b18622670ea702205cd6fdc5 |
|
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> |
|
Date: Tue Feb 28 14:23:59 2023 -0300 |
|
|
|
powerpc: Remove powerpc64 strncmp variants |
|
|
|
The default, and power7 implementation just adds word aligned |
|
access when inputs have the same aligment. The unaligned case |
|
is still done by byte operations. |
|
|
|
This is already covered by the generic implementation, which also add |
|
the unaligned input optimization. |
|
|
|
Checked on powerpc64-linux-gnu built without multi-arch for powerpc64, |
|
power7, power8, and power9 (build for le). |
|
Reviewed-by: Rajalakshmi Srinivasaraghavan <rajis@linux.ibm.com> |
|
|
|
Conflicts: |
|
sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S |
|
sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S |
|
sysdeps/powerpc/powerpc64/power7/strncmp.S |
|
sysdeps/powerpc/powerpc64/strncmp.S |
|
(copyright year changes upstream) |
|
|
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile |
|
index 5b20dab108de14ab..0ee7ce39d6470d80 100644 |
|
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile |
|
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile |
|
@@ -12,7 +12,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \ |
|
strnlen-power8 strnlen-power7 strnlen-ppc64 \ |
|
strcasecmp-power7 strcasecmp_l-power7 \ |
|
strncase-power7 strncase_l-power7 \ |
|
- strncmp-power8 strncmp-power7 strncmp-ppc64 \ |
|
+ strncmp-power8 strncmp-ppc64 \ |
|
strchr-power8 strchr-power7 strchr-ppc64 \ |
|
strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \ |
|
strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \ |
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c |
|
index 914e7d5e28a98b5d..2c84d287ee76a7ea 100644 |
|
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c |
|
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c |
|
@@ -175,8 +175,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, |
|
#endif |
|
IFUNC_IMPL_ADD (array, i, strncmp, hwcap2 & PPC_FEATURE2_ARCH_2_07, |
|
__strncmp_power8) |
|
- IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_ARCH_2_06, |
|
- __strncmp_power7) |
|
IFUNC_IMPL_ADD (array, i, strncmp, 1, |
|
__strncmp_ppc)) |
|
|
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S |
|
deleted file mode 100644 |
|
index 8282ff076c9e00ce..0000000000000000 |
|
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S |
|
+++ /dev/null |
|
@@ -1,23 +0,0 @@ |
|
-/* Copyright (C) 2013-2021 Free Software Foundation, Inc. |
|
- This file is part of the GNU C Library. |
|
- |
|
- The GNU C Library is free software; you can redistribute it and/or |
|
- modify it under the terms of the GNU Lesser General Public |
|
- License as published by the Free Software Foundation; either |
|
- version 2.1 of the License, or (at your option) any later version. |
|
- |
|
- The GNU C Library is distributed in the hope that it will be useful, |
|
- but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
- Lesser General Public License for more details. |
|
- |
|
- You should have received a copy of the GNU Lesser General Public |
|
- License along with the GNU C Library; if not, see |
|
- <https://www.gnu.org/licenses/>. */ |
|
- |
|
-#define STRNCMP __strncmp_power7 |
|
- |
|
-#undef libc_hidden_builtin_def |
|
-#define libc_hidden_builtin_def(name) |
|
- |
|
-#include <sysdeps/powerpc/powerpc64/power7/strncmp.S> |
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S |
|
deleted file mode 100644 |
|
index c6f325650c9ace3b..0000000000000000 |
|
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S |
|
+++ /dev/null |
|
@@ -1,26 +0,0 @@ |
|
-/* Copyright (C) 2013-2021 Free Software Foundation, Inc. |
|
- This file is part of the GNU C Library. |
|
- |
|
- The GNU C Library is free software; you can redistribute it and/or |
|
- modify it under the terms of the GNU Lesser General Public |
|
- License as published by the Free Software Foundation; either |
|
- version 2.1 of the License, or (at your option) any later version. |
|
- |
|
- The GNU C Library is distributed in the hope that it will be useful, |
|
- but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
- Lesser General Public License for more details. |
|
- |
|
- You should have received a copy of the GNU Lesser General Public |
|
- License along with the GNU C Library; if not, see |
|
- <https://www.gnu.org/licenses/>. */ |
|
- |
|
-#if defined SHARED && IS_IN (libc) |
|
-# define STRNCMP __strncmp_ppc |
|
- |
|
-# undef libc_hidden_builtin_def |
|
-# define libc_hidden_builtin_def(name) \ |
|
- .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc |
|
-#endif |
|
- |
|
-#include <sysdeps/powerpc/powerpc64/strncmp.S> |
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c |
|
new file mode 100644 |
|
index 0000000000000000..09cc009a913ed169 |
|
--- /dev/null |
|
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c |
|
@@ -0,0 +1,7 @@ |
|
+#if defined SHARED && IS_IN (libc) |
|
+# define STRNCMP __strncmp_ppc |
|
+# undef libc_hidden_builtin_def |
|
+# define libc_hidden_builtin_def(name) \ |
|
+ __hidden_ver1 (__strncmp_ppc, __GI_strncmp, __strncmp_ppc); |
|
+#endif |
|
+#include <string/strncmp.c> |
|
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c |
|
index 275a558e4afa7d61..df2c0707a919ad79 100644 |
|
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c |
|
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c |
|
@@ -26,7 +26,6 @@ |
|
# include "init-arch.h" |
|
|
|
extern __typeof (strncmp) __strncmp_ppc attribute_hidden; |
|
-extern __typeof (strncmp) __strncmp_power7 attribute_hidden; |
|
extern __typeof (strncmp) __strncmp_power8 attribute_hidden; |
|
# ifdef __LITTLE_ENDIAN__ |
|
extern __typeof (strncmp) __strncmp_power9 attribute_hidden; |
|
@@ -43,7 +42,5 @@ libc_ifunc_redirected (__redirect_strncmp, strncmp, |
|
# endif |
|
(hwcap2 & PPC_FEATURE2_ARCH_2_07) |
|
? __strncmp_power8 |
|
- : (hwcap & PPC_FEATURE_ARCH_2_06) |
|
- ? __strncmp_power7 |
|
- : __strncmp_ppc); |
|
+ : __strncmp_ppc); |
|
#endif |
|
diff --git a/sysdeps/powerpc/powerpc64/power7/strncmp.S b/sysdeps/powerpc/powerpc64/power7/strncmp.S |
|
deleted file mode 100644 |
|
index d91aeb6077a558f2..0000000000000000 |
|
--- a/sysdeps/powerpc/powerpc64/power7/strncmp.S |
|
+++ /dev/null |
|
@@ -1,228 +0,0 @@ |
|
-/* Optimized strcmp implementation for POWER7/PowerPC64. |
|
- Copyright (C) 2010-2021 Free Software Foundation, Inc. |
|
- This file is part of the GNU C Library. |
|
- |
|
- The GNU C Library is free software; you can redistribute it and/or |
|
- modify it under the terms of the GNU Lesser General Public |
|
- License as published by the Free Software Foundation; either |
|
- version 2.1 of the License, or (at your option) any later version. |
|
- |
|
- The GNU C Library is distributed in the hope that it will be useful, |
|
- but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
- Lesser General Public License for more details. |
|
- |
|
- You should have received a copy of the GNU Lesser General Public |
|
- License along with the GNU C Library; if not, see |
|
- <https://www.gnu.org/licenses/>. */ |
|
- |
|
-#include <sysdep.h> |
|
- |
|
-#ifndef STRNCMP |
|
-# define STRNCMP strncmp |
|
-#endif |
|
- |
|
-/* See strlen.s for comments on how the end-of-string testing works. */ |
|
- |
|
-/* int [r3] strncmp (const char *s1 [r3], |
|
- const char *s2 [r4], |
|
- size_t size [r5]) */ |
|
- |
|
- .machine power7 |
|
-ENTRY_TOCLESS (STRNCMP, 5) |
|
- CALL_MCOUNT 3 |
|
- |
|
-#define rTMP2 r0 |
|
-#define rRTN r3 |
|
-#define rSTR1 r3 /* first string arg */ |
|
-#define rSTR2 r4 /* second string arg */ |
|
-#define rN r5 /* max string length */ |
|
-#define rWORD1 r6 /* current word in s1 */ |
|
-#define rWORD2 r7 /* current word in s2 */ |
|
-#define rWORD3 r10 |
|
-#define rWORD4 r11 |
|
-#define rFEFE r8 /* constant 0xfefefefefefefeff (-0x0101010101010101) */ |
|
-#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */ |
|
-#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */ |
|
-#define rBITDIF r11 /* bits that differ in s1 & s2 words */ |
|
-#define rTMP r12 |
|
- |
|
- dcbt 0,rSTR1 |
|
- nop |
|
- or rTMP,rSTR2,rSTR1 |
|
- lis r7F7F,0x7f7f |
|
- dcbt 0,rSTR2 |
|
- nop |
|
- clrldi. rTMP,rTMP,61 |
|
- cmpldi cr1,rN,0 |
|
- lis rFEFE,-0x101 |
|
- bne L(unaligned) |
|
-/* We are doubleword aligned so set up for two loops. first a double word |
|
- loop, then fall into the byte loop if any residual. */ |
|
- srdi. rTMP,rN,3 |
|
- clrldi rN,rN,61 |
|
- addi rFEFE,rFEFE,-0x101 |
|
- addi r7F7F,r7F7F,0x7f7f |
|
- cmpldi cr1,rN,0 |
|
- beq L(unaligned) |
|
- |
|
- mtctr rTMP |
|
- ld rWORD1,0(rSTR1) |
|
- ld rWORD2,0(rSTR2) |
|
- sldi rTMP,rFEFE,32 |
|
- insrdi r7F7F,r7F7F,32,0 |
|
- add rFEFE,rFEFE,rTMP |
|
- b L(g1) |
|
- |
|
-L(g0): |
|
- ldu rWORD1,8(rSTR1) |
|
- bne cr1,L(different) |
|
- ldu rWORD2,8(rSTR2) |
|
-L(g1): add rTMP,rFEFE,rWORD1 |
|
- nor rNEG,r7F7F,rWORD1 |
|
- bdz L(tail) |
|
- and. rTMP,rTMP,rNEG |
|
- cmpd cr1,rWORD1,rWORD2 |
|
- beq L(g0) |
|
- |
|
-/* OK. We've hit the end of the string. We need to be careful that |
|
- we don't compare two strings as different because of gunk beyond |
|
- the end of the strings... */ |
|
- |
|
-#ifdef __LITTLE_ENDIAN__ |
|
-L(endstring): |
|
- addi rTMP2, rTMP, -1 |
|
- beq cr1, L(equal) |
|
- andc rTMP2, rTMP2, rTMP |
|
- rldimi rTMP2, rTMP2, 1, 0 |
|
- and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ |
|
- and rWORD1, rWORD1, rTMP2 |
|
- cmpd cr1, rWORD1, rWORD2 |
|
- beq cr1, L(equal) |
|
- cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */ |
|
- addi rNEG, rBITDIF, 1 |
|
- orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */ |
|
- sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */ |
|
- andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */ |
|
- andc rWORD2, rWORD2, rNEG |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt L(highbit) |
|
- sradi rRTN, rRTN, 63 /* must return an int. */ |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(equal): |
|
- li rRTN, 0 |
|
- blr |
|
- |
|
-L(different): |
|
- ld rWORD1, -8(rSTR1) |
|
- cmpb rBITDIF, rWORD1, rWORD2 /* 0xff on equal bytes. */ |
|
- addi rNEG, rBITDIF, 1 |
|
- orc rNEG, rNEG, rBITDIF /* 0's below LS differing byte. */ |
|
- sldi rNEG, rNEG, 8 /* 1's above LS differing byte. */ |
|
- andc rWORD1, rWORD1, rNEG /* mask off MS bytes. */ |
|
- andc rWORD2, rWORD2, rNEG |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt L(highbit) |
|
- sradi rRTN, rRTN, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(highbit): |
|
- sradi rRTN, rWORD2, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
- |
|
-#else |
|
-L(endstring): |
|
- and rTMP,r7F7F,rWORD1 |
|
- beq cr1,L(equal) |
|
- add rTMP,rTMP,r7F7F |
|
- xor. rBITDIF,rWORD1,rWORD2 |
|
- andc rNEG,rNEG,rTMP |
|
- blt L(highbit) |
|
- cntlzd rBITDIF,rBITDIF |
|
- cntlzd rNEG,rNEG |
|
- addi rNEG,rNEG,7 |
|
- cmpd cr1,rNEG,rBITDIF |
|
- sub rRTN,rWORD1,rWORD2 |
|
- blt cr1,L(equal) |
|
- sradi rRTN,rRTN,63 /* must return an int. */ |
|
- ori rRTN,rRTN,1 |
|
- blr |
|
-L(equal): |
|
- li rRTN,0 |
|
- blr |
|
- |
|
-L(different): |
|
- ld rWORD1,-8(rSTR1) |
|
- xor. rBITDIF,rWORD1,rWORD2 |
|
- sub rRTN,rWORD1,rWORD2 |
|
- blt L(highbit) |
|
- sradi rRTN,rRTN,63 |
|
- ori rRTN,rRTN,1 |
|
- blr |
|
-L(highbit): |
|
- sradi rRTN,rWORD2,63 |
|
- ori rRTN,rRTN,1 |
|
- blr |
|
-#endif |
|
- |
|
-/* Oh well. In this case, we just do a byte-by-byte comparison. */ |
|
- .align 4 |
|
-L(tail): |
|
- and. rTMP,rTMP,rNEG |
|
- cmpd cr1,rWORD1,rWORD2 |
|
- bne L(endstring) |
|
- addi rSTR1,rSTR1,8 |
|
- bne cr1,L(different) |
|
- addi rSTR2,rSTR2,8 |
|
- cmpldi cr1,rN,0 |
|
-L(unaligned): |
|
- mtctr rN |
|
- ble cr1,L(ux) |
|
-L(uz): |
|
- lbz rWORD1,0(rSTR1) |
|
- lbz rWORD2,0(rSTR2) |
|
- .align 4 |
|
-L(u1): |
|
- cmpdi cr1,rWORD1,0 |
|
- bdz L(u4) |
|
- cmpd rWORD1,rWORD2 |
|
- beq cr1,L(u4) |
|
- bne L(u4) |
|
- lbzu rWORD3,1(rSTR1) |
|
- lbzu rWORD4,1(rSTR2) |
|
- cmpdi cr1,rWORD3,0 |
|
- bdz L(u3) |
|
- cmpd rWORD3,rWORD4 |
|
- beq cr1,L(u3) |
|
- bne L(u3) |
|
- lbzu rWORD1,1(rSTR1) |
|
- lbzu rWORD2,1(rSTR2) |
|
- cmpdi cr1,rWORD1,0 |
|
- bdz L(u4) |
|
- cmpd rWORD1,rWORD2 |
|
- beq cr1,L(u4) |
|
- bne L(u4) |
|
- lbzu rWORD3,1(rSTR1) |
|
- lbzu rWORD4,1(rSTR2) |
|
- cmpdi cr1,rWORD3,0 |
|
- bdz L(u3) |
|
- cmpd rWORD3,rWORD4 |
|
- beq cr1,L(u3) |
|
- bne L(u3) |
|
- lbzu rWORD1,1(rSTR1) |
|
- lbzu rWORD2,1(rSTR2) |
|
- b L(u1) |
|
- |
|
-L(u3): sub rRTN,rWORD3,rWORD4 |
|
- blr |
|
-L(u4): sub rRTN,rWORD1,rWORD2 |
|
- blr |
|
-L(ux): |
|
- li rRTN,0 |
|
- blr |
|
-END (STRNCMP) |
|
-libc_hidden_builtin_def (strncmp) |
|
diff --git a/sysdeps/powerpc/powerpc64/strncmp.S b/sysdeps/powerpc/powerpc64/strncmp.S |
|
deleted file mode 100644 |
|
index 40a230242cbdf733..0000000000000000 |
|
--- a/sysdeps/powerpc/powerpc64/strncmp.S |
|
+++ /dev/null |
|
@@ -1,210 +0,0 @@ |
|
-/* Optimized strcmp implementation for PowerPC64. |
|
- Copyright (C) 2003-2021 Free Software Foundation, Inc. |
|
- This file is part of the GNU C Library. |
|
- |
|
- The GNU C Library is free software; you can redistribute it and/or |
|
- modify it under the terms of the GNU Lesser General Public |
|
- License as published by the Free Software Foundation; either |
|
- version 2.1 of the License, or (at your option) any later version. |
|
- |
|
- The GNU C Library is distributed in the hope that it will be useful, |
|
- but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
- Lesser General Public License for more details. |
|
- |
|
- You should have received a copy of the GNU Lesser General Public |
|
- License along with the GNU C Library; if not, see |
|
- <https://www.gnu.org/licenses/>. */ |
|
- |
|
-#include <sysdep.h> |
|
- |
|
-/* See strlen.s for comments on how the end-of-string testing works. */ |
|
- |
|
-/* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */ |
|
- |
|
-#ifndef STRNCMP |
|
-# define STRNCMP strncmp |
|
-#endif |
|
- |
|
-ENTRY_TOCLESS (STRNCMP, 4) |
|
- CALL_MCOUNT 3 |
|
- |
|
-#define rTMP2 r0 |
|
-#define rRTN r3 |
|
-#define rSTR1 r3 /* first string arg */ |
|
-#define rSTR2 r4 /* second string arg */ |
|
-#define rN r5 /* max string length */ |
|
-#define rWORD1 r6 /* current word in s1 */ |
|
-#define rWORD2 r7 /* current word in s2 */ |
|
-#define rFEFE r8 /* constant 0xfefefefefefefeff (-0x0101010101010101) */ |
|
-#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */ |
|
-#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */ |
|
-#define rBITDIF r11 /* bits that differ in s1 & s2 words */ |
|
-#define rTMP r12 |
|
- |
|
- dcbt 0,rSTR1 |
|
- or rTMP, rSTR2, rSTR1 |
|
- lis r7F7F, 0x7f7f |
|
- dcbt 0,rSTR2 |
|
- clrldi. rTMP, rTMP, 61 |
|
- cmpldi cr1, rN, 0 |
|
- lis rFEFE, -0x101 |
|
- bne L(unaligned) |
|
-/* We are doubleword aligned so set up for two loops. first a double word |
|
- loop, then fall into the byte loop if any residual. */ |
|
- srdi. rTMP, rN, 3 |
|
- clrldi rN, rN, 61 |
|
- addi rFEFE, rFEFE, -0x101 |
|
- addi r7F7F, r7F7F, 0x7f7f |
|
- cmpldi cr1, rN, 0 |
|
- beq L(unaligned) |
|
- |
|
- mtctr rTMP /* Power4 wants mtctr 1st in dispatch group. */ |
|
- ld rWORD1, 0(rSTR1) |
|
- ld rWORD2, 0(rSTR2) |
|
- sldi rTMP, rFEFE, 32 |
|
- insrdi r7F7F, r7F7F, 32, 0 |
|
- add rFEFE, rFEFE, rTMP |
|
- b L(g1) |
|
- |
|
-L(g0): |
|
- ldu rWORD1, 8(rSTR1) |
|
- bne- cr1, L(different) |
|
- ldu rWORD2, 8(rSTR2) |
|
-L(g1): add rTMP, rFEFE, rWORD1 |
|
- nor rNEG, r7F7F, rWORD1 |
|
- bdz L(tail) |
|
- and. rTMP, rTMP, rNEG |
|
- cmpd cr1, rWORD1, rWORD2 |
|
- beq+ L(g0) |
|
- |
|
-/* OK. We've hit the end of the string. We need to be careful that |
|
- we don't compare two strings as different because of gunk beyond |
|
- the end of the strings... */ |
|
- |
|
-#ifdef __LITTLE_ENDIAN__ |
|
-L(endstring): |
|
- addi rTMP2, rTMP, -1 |
|
- beq cr1, L(equal) |
|
- andc rTMP2, rTMP2, rTMP |
|
- rldimi rTMP2, rTMP2, 1, 0 |
|
- and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ |
|
- and rWORD1, rWORD1, rTMP2 |
|
- cmpd cr1, rWORD1, rWORD2 |
|
- beq cr1, L(equal) |
|
- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */ |
|
- neg rNEG, rBITDIF |
|
- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */ |
|
- cntlzd rNEG, rNEG /* bitcount of the bit. */ |
|
- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */ |
|
- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */ |
|
- sld rWORD2, rWORD2, rNEG |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt- L(highbit) |
|
- sradi rRTN, rRTN, 63 /* must return an int. */ |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(equal): |
|
- li rRTN, 0 |
|
- blr |
|
- |
|
-L(different): |
|
- ld rWORD1, -8(rSTR1) |
|
- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */ |
|
- neg rNEG, rBITDIF |
|
- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */ |
|
- cntlzd rNEG, rNEG /* bitcount of the bit. */ |
|
- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */ |
|
- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */ |
|
- sld rWORD2, rWORD2, rNEG |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt- L(highbit) |
|
- sradi rRTN, rRTN, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(highbit): |
|
- sradi rRTN, rWORD2, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
- |
|
-#else |
|
-L(endstring): |
|
- and rTMP, r7F7F, rWORD1 |
|
- beq cr1, L(equal) |
|
- add rTMP, rTMP, r7F7F |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- andc rNEG, rNEG, rTMP |
|
- blt- L(highbit) |
|
- cntlzd rBITDIF, rBITDIF |
|
- cntlzd rNEG, rNEG |
|
- addi rNEG, rNEG, 7 |
|
- cmpd cr1, rNEG, rBITDIF |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt- cr1, L(equal) |
|
- sradi rRTN, rRTN, 63 /* must return an int. */ |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(equal): |
|
- li rRTN, 0 |
|
- blr |
|
- |
|
-L(different): |
|
- ld rWORD1, -8(rSTR1) |
|
- xor. rBITDIF, rWORD1, rWORD2 |
|
- sub rRTN, rWORD1, rWORD2 |
|
- blt- L(highbit) |
|
- sradi rRTN, rRTN, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-L(highbit): |
|
- sradi rRTN, rWORD2, 63 |
|
- ori rRTN, rRTN, 1 |
|
- blr |
|
-#endif |
|
- |
|
-/* Oh well. In this case, we just do a byte-by-byte comparison. */ |
|
- .align 4 |
|
-L(tail): |
|
- and. rTMP, rTMP, rNEG |
|
- cmpd cr1, rWORD1, rWORD2 |
|
- bne- L(endstring) |
|
- addi rSTR1, rSTR1, 8 |
|
- bne- cr1, L(different) |
|
- addi rSTR2, rSTR2, 8 |
|
- cmpldi cr1, rN, 0 |
|
-L(unaligned): |
|
- mtctr rN /* Power4 wants mtctr 1st in dispatch group */ |
|
- bgt cr1, L(uz) |
|
-L(ux): |
|
- li rRTN, 0 |
|
- blr |
|
- .align 4 |
|
-L(uz): |
|
- lbz rWORD1, 0(rSTR1) |
|
- lbz rWORD2, 0(rSTR2) |
|
- nop |
|
- b L(u1) |
|
-L(u0): |
|
- lbzu rWORD2, 1(rSTR2) |
|
-L(u1): |
|
- bdz L(u3) |
|
- cmpdi cr1, rWORD1, 0 |
|
- cmpd rWORD1, rWORD2 |
|
- beq- cr1, L(u3) |
|
- lbzu rWORD1, 1(rSTR1) |
|
- bne- L(u2) |
|
- lbzu rWORD2, 1(rSTR2) |
|
- bdz L(u3) |
|
- cmpdi cr1, rWORD1, 0 |
|
- cmpd rWORD1, rWORD2 |
|
- bne- L(u3) |
|
- lbzu rWORD1, 1(rSTR1) |
|
- bne+ cr1, L(u0) |
|
- |
|
-L(u2): lbzu rWORD1, -1(rSTR1) |
|
-L(u3): sub rRTN, rWORD1, rWORD2 |
|
- blr |
|
-END (STRNCMP) |
|
-libc_hidden_builtin_def (strncmp)
|
|
|