From 4311e93f80e7cdd95914cfd08d4ec2720d380291 Mon Sep 17 00:00:00 2001 From: JayDDee Date: Thu, 16 Nov 2023 01:17:05 -0500 Subject: [PATCH] Updated Support for AArch64 (markdown) --- Support-for-AArch64.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Support-for-AArch64.md b/Support-for-AArch64.md index 39f621f..a26a50c 100644 --- a/Support-for-AArch64.md +++ b/Support-for-AArch64.md @@ -84,7 +84,7 @@ RISC-V Some notable observations about the problems observed: -Verthash is a mystery, it only produces rejects on ARM even with no targtetted code, only compiled C. The same C source works on x86_64 but not on AArch64. Tried with -O3 & -O2. In all other cases falling back to C was always successful. Verthash data file creation and verification work. +Verthash is a mystery, it only produces rejects on ARM even with no targtetted code, only compiled C. The same C source works on x86_64 but not on AArch64. Tried with -O3 & -O2. In all other cases falling back to C was always successful. Verthash data file creation and verification work. Verthash has one unique feature in the data-file. No other algo has that and no other algo fails with unoptimized code. There are a few cases where translating from SSE2 to NEON is diffiult or the workaround kills performance. NEON, being RISC, has no microcode so no programmable shuffle instruction. The only shuffling I can find is sub-vector word & sub-word bit, shift, rotate & reverse. Notably SSE2 can't do bit reversal but can shuffle bytes any which way.