diff options
| author | Kito Cheng <kito.cheng@gmail.com> | 2019-03-22 16:43:20 -0400 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2019-03-25 10:35:32 +0000 |
| commit | 896f51fbfa132a6d05a1195f45d6bd9e9df07893 (patch) | |
| tree | 680a004dae56a7d9d777cb54830f9927dfac2abb /tests | |
| parent | 7ca96e1a9cadc32af7df73dcf4438b08667d07a6 (diff) | |
hardfloat: fix float32/64 fused multiply-add
Before falling back to softfloat FMA, we do not restore the original
values of inputs A and C. Fix it.
This bug was caught by running gcc's testsuite on RISC-V qemu.
Note that this change gives a small perf increase for fp-bench:
Host: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
Command: perf stat -r 3 taskset -c 0 ./fp-bench -o mulAdd -p $prec
- $prec = single:
- before:
101.71 MFlops
102.18 MFlops
100.96 MFlops
- after:
103.63 MFlops
103.05 MFlops
102.96 MFlops
- $prec = double:
- before:
173.10 MFlops
173.93 MFlops
172.11 MFlops
- after:
178.49 MFlops
178.88 MFlops
178.66 MFlops
Signed-off-by: Kito Cheng <kito.cheng@gmail.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <20190322204320.17777-1-cota@braap.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Diffstat (limited to 'tests')
0 files changed, 0 insertions, 0 deletions