From 0e752a6e215aee21dc73da097c3225495d54a5b6 Mon Sep 17 00:00:00 2001 From: SoniEx2 Date: Fri, 9 Apr 2021 07:19:03 -0300 Subject: Add libotr/etc sources --- libotr/libgcrypt-1.8.7/mpi/mips3/README | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 libotr/libgcrypt-1.8.7/mpi/mips3/README (limited to 'libotr/libgcrypt-1.8.7/mpi/mips3/README') diff --git a/libotr/libgcrypt-1.8.7/mpi/mips3/README b/libotr/libgcrypt-1.8.7/mpi/mips3/README new file mode 100644 index 0000000..4ba4546 --- /dev/null +++ b/libotr/libgcrypt-1.8.7/mpi/mips3/README @@ -0,0 +1,23 @@ +This directory contains mpn functions optimized for MIPS3. Example of +processors that implement MIPS3 are R4000, R4400, R4600, R4700, and R8000. + +RELEVANT OPTIMIZATION ISSUES + +1. On the R4000 and R4400, branches, both the plain and the "likely" ones, + take 3 cycles to execute. (The fastest possible loop will take 4 cycles, + because of the delay insn.) + + On the R4600, branches takes a single cycle + + On the R8000, branches often take no noticeable cycles, as they are + executed in a separate function unit.. + +2. The R4000 and R4400 have a load latency of 4 cycles. + +3. On the R4000 and R4400, multiplies take a data-dependent number of + cycles, contrary to the SGI documentation. There seem to be 3 or 4 + possible latencies. + +STATUS + +Good... -- cgit 1.4.1