While testing the float128_muladd changes for s390x host, emulating under x86_64 of course, I noticed that the code we generate for strings of ALCGR and SLBGR is pretty awful.
I realized that we were missing a trick: the output cc is based only on the output (result and carry) and so we don't need to save the inputs. And once we do that, we can use the output carry as a direct input to the next insn. Changes for v2: * Add a few more comments, and enhance the patch descriptions. r~ Richard Henderson (4): target/s390x: Improve cc computation for ADD LOGICAL target/s390x: Improve ADD LOGICAL WITH CARRY target/s390x: Improve cc computation for SUBTRACT LOGICAL target/s390x: Improve SUB LOGICAL WITH BORROW target/s390x/internal.h | 11 +- target/s390x/cc_helper.c | 123 +++------------- target/s390x/helper.c | 10 +- target/s390x/translate.c | 289 ++++++++++++++++++++----------------- target/s390x/insn-data.def | 76 +++++----- 5 files changed, 216 insertions(+), 293 deletions(-) -- 2.25.1