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Fri, 6 Jun 2025 17:45:20 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 470eaktb88-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 06 Jun 2025 17:45:19 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 556HjIR646596382 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 6 Jun 2025 17:45:18 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 500A020049; Fri, 6 Jun 2025 17:45:18 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 972A420040; Fri, 6 Jun 2025 17:45:17 +0000 (GMT) Received: from kubota.pok.stglabs.ibm.com (unknown [9.114.39.181]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 6 Jun 2025 17:45:17 +0000 (GMT) From: Sachin Monga To: libc-alpha@sourceware.org Cc: bergner@tenstorrent.com, Sachin Monga Subject: [PATCH v1] powerpc64le: Revert "Optimized strcmp for power10" Date: Fri, 6 Jun 2025 12:45:01 -0500 Message-ID: <20250606174501.3398303-1-smonga@linux.ibm.com> X-Mailer: git-send-email 2.43.5 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjA2MDE1MCBTYWx0ZWRfXxMkf7sLEqWbE R9VW7h8nwAsRkIvKVY7OkRw8tlIIO7XFyz52oVGW6slcio8s3ry9nPXf2p51Y3919tZ2604KmbQ jy4e666JVnvN1dLIsr0OshKEu/ODY2lLLxmn8EAPIXiuOwlHXKj3CemvAQ3Cj6ukKFbufCnedH5 OQoqR94kGrc9u9BMsSpnimtpUdixUa5WD9H4w/1Az4/CvUX5elRdywWctPuUjLPee6m1lcQ+aiW MR2any0DlbpvKlCujPUL4mS7S/9repHzPCxY3ZVISj0Kz7WYe5A+x19DS8iGew03UcO1cMHF0PV kw0O+DE/BV02zOF109iG22jhZDNKKgH8UQPl8EyVofbb7HkI269xayqLVTIw9j45kJr+skT4vgU EeH5bBs/YC3p30LXezonFuttp7Epf4d34OUIN1l2EIXileE/PAN21FLSeS5Pt9ANp+cXc+JE X-Proofpoint-GUID: YLMFCRSWgu4hZ9IvfhYLTa5kA3PNmFYs X-Proofpoint-ORIG-GUID: YLMFCRSWgu4hZ9IvfhYLTa5kA3PNmFYs X-Authority-Analysis: v=2.4 cv=QtVe3Uyd c=1 sm=1 tr=0 ts=68432930 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=6IFa9wvqVegA:10 a=mDV3o1hIAAAA:8 a=VnNF1IyMAAAA:8 a=IA0WEcIimpBjgKZksCUA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-06_06,2025-06-05_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 bulkscore=0 adultscore=0 phishscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=960 lowpriorityscore=0 spamscore=0 clxscore=1015 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506060150 X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, RCVD_IN_VALIDITY_RPBL_BLOCKED, RCVD_IN_VALIDITY_SAFE_BLOCKED, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patchwork=sourceware.org@sourceware.org This reverts commit 3367d8e180848030d1646f088759f02b8dfe0d6f. Reason for revert: Power 10 strcmp clobbers nonvolatile vector registers (bug 33056). Signed-off-by: Sachin Monga Reviewed-by: Siddhesh Poyarekar --- This patch is reg tested. sysdeps/powerpc/powerpc64/le/power10/strcmp.S | 233 ------------------ sysdeps/powerpc/powerpc64/multiarch/Makefile | 2 +- .../powerpc64/multiarch/ifunc-impl-list.c | 4 - .../powerpc64/multiarch/strcmp-power10.S | 26 -- sysdeps/powerpc/powerpc64/multiarch/strcmp.c | 4 - 5 files changed, 1 insertion(+), 268 deletions(-) delete mode 100644 sysdeps/powerpc/powerpc64/le/power10/strcmp.S delete mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcmp-power10.S diff --git a/sysdeps/powerpc/powerpc64/le/power10/strcmp.S b/sysdeps/powerpc/powerpc64/le/power10/strcmp.S deleted file mode 100644 index fffa1ee0a9..0000000000 --- a/sysdeps/powerpc/powerpc64/le/power10/strcmp.S +++ /dev/null @@ -1,233 +0,0 @@ -/* Optimized strcmp implementation for PowerPC64/POWER10. - Copyright (C) 2021-2025 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 - . */ -#include - -#ifndef STRCMP -# define STRCMP strcmp -#endif - -/* Implements the function - int [r3] strcmp (const char *s1 [r3], const char *s2 [r4]). */ - -/* TODO: Change this to actual instructions when minimum binutils is upgraded - to 2.27. Macros are defined below for these newer instructions in order - to maintain compatibility. */ - -#define LXVP(xtp,dq,ra) \ - .long(((6)<<(32-6)) \ - | ((((xtp)-32)>>1)<<(32-10)) \ - | ((1)<<(32-11)) \ - | ((ra)<<(32-16)) \ - | dq) - -#define COMPARE_16(vreg1,vreg2,offset) \ - lxv vreg1+32,offset(r3); \ - lxv vreg2+32,offset(r4); \ - vcmpnezb. v7,vreg1,vreg2; \ - bne cr6,L(different); \ - -#define COMPARE_32(vreg1,vreg2,offset,label1,label2) \ - LXVP(vreg1+32,offset,r3); \ - LXVP(vreg2+32,offset,r4); \ - vcmpnezb. v7,vreg1+1,vreg2+1; \ - bne cr6,L(label1); \ - vcmpnezb. v7,vreg1,vreg2; \ - bne cr6,L(label2); \ - -#define TAIL(vreg1,vreg2) \ - vctzlsbb r6,v7; \ - vextubrx r5,r6,vreg1; \ - vextubrx r4,r6,vreg2; \ - subf r3,r4,r5; \ - blr; \ - -#define CHECK_N_BYTES(reg1,reg2,len_reg) \ - sldi r0,len_reg,56; \ - lxvl 32+v4,reg1,r0; \ - lxvl 32+v5,reg2,r0; \ - add reg1,reg1,len_reg; \ - add reg2,reg2,len_reg; \ - vcmpnezb v7,v4,v5; \ - vctzlsbb r6,v7; \ - cmpld cr7,r6,len_reg; \ - blt cr7,L(different); \ - - /* TODO: change this to .machine power10 when the minimum required - binutils allows it. */ - - .machine power9 -ENTRY_TOCLESS (STRCMP, 4) - andi. r7,r3,4095 - andi. r8,r4,4095 - cmpldi cr0,r7,4096-16 - cmpldi cr1,r8,4096-16 - bgt cr0,L(crosses) - bgt cr1,L(crosses) - COMPARE_16(v4,v5,0) - -L(crosses): - andi. r7,r3,15 - subfic r7,r7,16 /* r7(nalign1) = 16 - (str1 & 15). */ - andi. r9,r4,15 - subfic r5,r9,16 /* r5(nalign2) = 16 - (str2 & 15). */ - cmpld cr7,r7,r5 - beq cr7,L(same_aligned) - blt cr7,L(nalign1_min) - - /* nalign2 is minimum and s2 pointer is aligned. */ - CHECK_N_BYTES(r3,r4,r5) - /* Are we on the 64B hunk which crosses a page? */ - andi. r10,r3,63 /* Determine offset into 64B hunk. */ - andi. r8,r3,15 /* The offset into the 16B hunk. */ - neg r7,r3 - andi. r9,r7,15 /* Number of bytes after a 16B cross. */ - rlwinm. r7,r7,26,0x3F /* ((r3-4096))>>6&63. */ - beq L(compare_64_pagecross) - mtctr r7 - b L(compare_64B_unaligned) - - /* nalign1 is minimum and s1 pointer is aligned. */ -L(nalign1_min): - CHECK_N_BYTES(r3,r4,r7) - /* Are we on the 64B hunk which crosses a page? */ - andi. r10,r4,63 /* Determine offset into 64B hunk. */ - andi. r8,r4,15 /* The offset into the 16B hunk. */ - neg r7,r4 - andi. r9,r7,15 /* Number of bytes after a 16B cross. */ - rlwinm. r7,r7,26,0x3F /* ((r4-4096))>>6&63. */ - beq L(compare_64_pagecross) - mtctr r7 - - .p2align 5 -L(compare_64B_unaligned): - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - COMPARE_16(v4,v5,32) - COMPARE_16(v4,v5,48) - addi r3,r3,64 - addi r4,r4,64 - bdnz L(compare_64B_unaligned) - - /* Cross the page boundary of s2, carefully. Only for first - iteration we have to get the count of 64B blocks to be checked. - From second iteration and beyond, loop counter is always 63. */ -L(compare_64_pagecross): - li r11, 63 - mtctr r11 - cmpldi r10,16 - ble L(cross_4) - cmpldi r10,32 - ble L(cross_3) - cmpldi r10,48 - ble L(cross_2) -L(cross_1): - CHECK_N_BYTES(r3,r4,r9) - CHECK_N_BYTES(r3,r4,r8) - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - COMPARE_16(v4,v5,32) - addi r3,r3,48 - addi r4,r4,48 - b L(compare_64B_unaligned) -L(cross_2): - COMPARE_16(v4,v5,0) - addi r3,r3,16 - addi r4,r4,16 - CHECK_N_BYTES(r3,r4,r9) - CHECK_N_BYTES(r3,r4,r8) - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - addi r3,r3,32 - addi r4,r4,32 - b L(compare_64B_unaligned) -L(cross_3): - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - addi r3,r3,32 - addi r4,r4,32 - CHECK_N_BYTES(r3,r4,r9) - CHECK_N_BYTES(r3,r4,r8) - COMPARE_16(v4,v5,0) - addi r3,r3,16 - addi r4,r4,16 - b L(compare_64B_unaligned) -L(cross_4): - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - COMPARE_16(v4,v5,32) - addi r3,r3,48 - addi r4,r4,48 - CHECK_N_BYTES(r3,r4,r9) - CHECK_N_BYTES(r3,r4,r8) - b L(compare_64B_unaligned) - -L(same_aligned): - CHECK_N_BYTES(r3,r4,r7) - /* Align s1 to 32B and adjust s2 address. - Use lxvp only if both s1 and s2 are 32B aligned. */ - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - COMPARE_16(v4,v5,32) - COMPARE_16(v4,v5,48) - addi r3,r3,64 - addi r4,r4,64 - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - - clrldi r6,r3,59 - subfic r5,r6,32 - add r3,r3,r5 - add r4,r4,r5 - andi. r5,r4,0x1F - beq cr0,L(32B_aligned_loop) - - .p2align 5 -L(16B_aligned_loop): - COMPARE_16(v4,v5,0) - COMPARE_16(v4,v5,16) - COMPARE_16(v4,v5,32) - COMPARE_16(v4,v5,48) - addi r3,r3,64 - addi r4,r4,64 - b L(16B_aligned_loop) - - /* Calculate and return the difference. */ -L(different): - TAIL(v4,v5) - - .p2align 5 -L(32B_aligned_loop): - COMPARE_32(v14,v16,0,tail1,tail2) - COMPARE_32(v18,v20,32,tail3,tail4) - COMPARE_32(v22,v24,64,tail5,tail6) - COMPARE_32(v26,v28,96,tail7,tail8) - addi r3,r3,128 - addi r4,r4,128 - b L(32B_aligned_loop) - -L(tail1): TAIL(v15,v17) -L(tail2): TAIL(v14,v16) -L(tail3): TAIL(v19,v21) -L(tail4): TAIL(v18,v20) -L(tail5): TAIL(v23,v25) -L(tail6): TAIL(v22,v24) -L(tail7): TAIL(v27,v29) -L(tail8): TAIL(v26,v28) - -END (STRCMP) -libc_hidden_builtin_def (strcmp) diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile index 624439d8c3..c9f7a98892 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/Makefile +++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile @@ -32,7 +32,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \ ifneq (,$(filter %le,$(config-machine))) sysdep_routines += memchr-power10 memcmp-power10 memcpy-power10 \ memmove-power10 memset-power10 rawmemchr-power9 \ - rawmemchr-power10 strcmp-power9 strcmp-power10 \ + rawmemchr-power10 strcmp-power9 \ strncmp-power9 strncmp-power10 strcpy-power9 strcat-power10 \ stpcpy-power9 strlen-power9 strncpy-power9 stpncpy-power9 \ strlen-power10 diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c index f3acd38b22..f3f2489cda 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c +++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c @@ -375,10 +375,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/powerpc/powerpc64/multiarch/strcmp.c. */ IFUNC_IMPL (i, name, strcmp, #ifdef __LITTLE_ENDIAN__ - IFUNC_IMPL_ADD (array, i, strcmp, - (hwcap2 & PPC_FEATURE2_ARCH_3_1) - && (hwcap & PPC_FEATURE_HAS_VSX), - __strcmp_power10) IFUNC_IMPL_ADD (array, i, strcmp, hwcap2 & PPC_FEATURE2_ARCH_3_00 && hwcap & PPC_FEATURE_HAS_ALTIVEC, diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcmp-power10.S b/sysdeps/powerpc/powerpc64/multiarch/strcmp-power10.S deleted file mode 100644 index 7b45fcd63a..0000000000 --- a/sysdeps/powerpc/powerpc64/multiarch/strcmp-power10.S +++ /dev/null @@ -1,26 +0,0 @@ -/* Optimized strcmp implementation for POWER10/PPC64. - Copyright (C) 2021-2025 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 - . */ - -#if defined __LITTLE_ENDIAN__ && IS_IN (libc) -#define STRCMP __strcmp_power10 - -#undef libc_hidden_builtin_def -#define libc_hidden_builtin_def(name) - -#include -#endif /* __LITTLE_ENDIAN__ && IS_IN (libc) */ diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcmp.c b/sysdeps/powerpc/powerpc64/multiarch/strcmp.c index 3c636e3bbc..7c77c084a7 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/strcmp.c +++ b/sysdeps/powerpc/powerpc64/multiarch/strcmp.c @@ -29,16 +29,12 @@ extern __typeof (strcmp) __strcmp_power7 attribute_hidden; extern __typeof (strcmp) __strcmp_power8 attribute_hidden; # ifdef __LITTLE_ENDIAN__ extern __typeof (strcmp) __strcmp_power9 attribute_hidden; -extern __typeof (strcmp) __strcmp_power10 attribute_hidden; # endif # undef strcmp libc_ifunc_redirected (__redirect_strcmp, strcmp, # ifdef __LITTLE_ENDIAN__ - (hwcap2 & PPC_FEATURE2_ARCH_3_1 - && hwcap & PPC_FEATURE_HAS_VSX) - ? __strcmp_power10 : (hwcap2 & PPC_FEATURE2_ARCH_3_00 && hwcap & PPC_FEATURE_HAS_ALTIVEC) ? __strcmp_power9 :