diff options
Diffstat (limited to 'contrib/arm-optimized-routines/string/aarch64/strlen-sve.S')
| -rw-r--r-- | contrib/arm-optimized-routines/string/aarch64/strlen-sve.S | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/contrib/arm-optimized-routines/string/aarch64/strlen-sve.S b/contrib/arm-optimized-routines/string/aarch64/strlen-sve.S deleted file mode 100644 index 2392493f1a3c..000000000000 --- a/contrib/arm-optimized-routines/string/aarch64/strlen-sve.S +++ /dev/null @@ -1,55 +0,0 @@ -/* - * __strlen_aarch64_sve - compute the length of a string - * - * Copyright (c) 2018-2021, Arm Limited. - * SPDX-License-Identifier: MIT - */ - -#include "../asmdefs.h" - -#if __ARM_FEATURE_SVE -/* Assumptions: - * - * ARMv8-a, AArch64 - * SVE Available. - */ - -ENTRY (__strlen_aarch64_sve) - PTR_ARG (0) - setffr /* initialize FFR */ - ptrue p2.b /* all ones; loop invariant */ - mov x1, 0 /* initialize length */ - - /* Read a vector's worth of bytes, stopping on first fault. */ - .p2align 4 -0: ldff1b z0.b, p2/z, [x0, x1] - rdffrs p0.b, p2/z - b.nlast 2f - - /* First fault did not fail: the whole vector is valid. - Avoid depending on the contents of FFR beyond the branch. */ - incb x1, all /* speculate increment */ - cmpeq p1.b, p2/z, z0.b, 0 /* loop if no zeros */ - b.none 0b - decb x1, all /* undo speculate */ - - /* Zero found. Select the bytes before the first and count them. */ -1: brkb p0.b, p2/z, p1.b - incp x1, p0.b - mov x0, x1 - ret - - /* First fault failed: only some of the vector is valid. - Perform the comparison only on the valid bytes. */ -2: cmpeq p1.b, p0/z, z0.b, 0 - b.any 1b - - /* No zero found. Re-init FFR, increment, and loop. */ - setffr - incp x1, p0.b - b 0b - -END (__strlen_aarch64_sve) - -#endif - |