diff options
Diffstat (limited to 'contrib/arm-optimized-routines/string/arm/strcmp.S')
| -rw-r--r-- | contrib/arm-optimized-routines/string/arm/strcmp.S | 59 |
1 files changed, 35 insertions, 24 deletions
diff --git a/contrib/arm-optimized-routines/string/arm/strcmp.S b/contrib/arm-optimized-routines/string/arm/strcmp.S index 51443e343058..74b3d235fb18 100644 --- a/contrib/arm-optimized-routines/string/arm/strcmp.S +++ b/contrib/arm-optimized-routines/string/arm/strcmp.S @@ -1,8 +1,8 @@ /* * strcmp for ARMv7 * - * Copyright (c) 2012-2021, Arm Limited. - * SPDX-License-Identifier: MIT + * Copyright (c) 2012-2022, Arm Limited. + * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception */ #if __ARM_ARCH >= 7 && __ARM_ARCH_ISA_ARM >= 1 @@ -12,7 +12,7 @@ is sufficiently aligned. Use saturating arithmetic to optimize the compares. */ -#include "../asmdefs.h" +#include "asmdefs.h" /* Build Options: STRCMP_NO_PRECHECK: Don't run a quick pre-check of the first @@ -26,6 +26,11 @@ #define STRCMP_NO_PRECHECK 0 +/* Ensure the .cantunwind directive is prepended to .fnend. + Leaf functions cannot throw exceptions - EHABI only supports + synchronous exceptions. */ +#define IS_LEAF + /* This version uses Thumb-2 code. */ .thumb .syntax unified @@ -98,8 +103,9 @@ ldrd r4, r5, [sp], #16 .cfi_restore 4 .cfi_restore 5 + .cfi_adjust_cfa_offset -16 sub result, result, r1, lsr #24 - bx lr + epilogue push_ip=HAVE_PAC_LEAF #else /* To use the big-endian trick we'd have to reverse all three words. that's slower than this approach. */ @@ -119,21 +125,15 @@ ldrd r4, r5, [sp], #16 .cfi_restore 4 .cfi_restore 5 + .cfi_adjust_cfa_offset -16 sub result, result, r1 - bx lr + epilogue push_ip=HAVE_PAC_LEAF #endif .endm - .p2align 5 -L(strcmp_start_addr): -#if STRCMP_NO_PRECHECK == 0 -L(fastpath_exit): - sub r0, r2, r3 - bx lr - nop -#endif -ENTRY_ALIGN (__strcmp_arm, 0) +ENTRY(__strcmp_arm) + prologue push_ip=HAVE_PAC_LEAF #if STRCMP_NO_PRECHECK == 0 ldrb r2, [src1] ldrb r3, [src2] @@ -143,13 +143,13 @@ ENTRY_ALIGN (__strcmp_arm, 0) bne L(fastpath_exit) #endif strd r4, r5, [sp, #-16]! - .cfi_def_cfa_offset 16 - .cfi_offset 4, -16 - .cfi_offset 5, -12 + .cfi_adjust_cfa_offset 16 + .cfi_rel_offset 4, 0 + .cfi_rel_offset 5, 4 orr tmp1, src1, src2 strd r6, r7, [sp, #8] - .cfi_offset 6, -8 - .cfi_offset 7, -4 + .cfi_rel_offset 6, 8 + .cfi_rel_offset 7, 12 mvn const_m1, #0 lsl r2, tmp1, #29 cbz r2, L(loop_aligned8) @@ -318,10 +318,19 @@ L(misaligned_exit): mov result, tmp1 ldr r4, [sp], #16 .cfi_restore 4 - bx lr + .cfi_adjust_cfa_offset -16 + epilogue push_ip=HAVE_PAC_LEAF #if STRCMP_NO_PRECHECK == 0 +L(fastpath_exit): + .cfi_restore_state + .cfi_remember_state + sub r0, r2, r3 + epilogue push_ip=HAVE_PAC_LEAF + L(aligned_m1): + .cfi_restore_state + .cfi_remember_state add src2, src2, #4 #endif L(src1_aligned): @@ -368,9 +377,9 @@ L(overlap3): /* R6/7 Not used in this sequence. */ .cfi_restore 6 .cfi_restore 7 + .cfi_adjust_cfa_offset -16 neg result, result - bx lr - + epilogue push_ip=HAVE_PAC_LEAF 6: .cfi_restore_state S2LO data1, data1, #24 @@ -445,7 +454,8 @@ L(strcmp_done_equal): /* R6/7 not used in this sequence. */ .cfi_restore 6 .cfi_restore 7 - bx lr + .cfi_adjust_cfa_offset -16 + epilogue push_ip=HAVE_PAC_LEAF L(strcmp_tail): .cfi_restore_state @@ -467,8 +477,9 @@ L(strcmp_tail): /* R6/7 not used in this sequence. */ .cfi_restore 6 .cfi_restore 7 + .cfi_adjust_cfa_offset -16 sub result, result, data2, lsr #24 - bx lr + epilogue push_ip=HAVE_PAC_LEAF END (__strcmp_arm) |