cmd/compile: adapt GOSSAHASH to set a DebugTest flag in ssa.Config
Binary search remains our friend.
Suppose you add an ought-to-be-benign pattern to PPC64.rules,
and make.bash starts crashing. You can guard the pattern(s)
with config.DebugTest:
(Eq8 x y) && config.DebugTest && isSigned(x.Type) &&
isSigned(y.Type) ->
(Equal (CMPW (SignExt8to32 x) (SignExt8to32 y)))
and then
gossahash -s ./make.bash
...
(go drink beer while silicon minions toil)
...
Trying ./make.bash args=[], env=[GOSSAHASH=
100110010111110]
./make.bash failed (1 distinct triggers): exit status 1
Trigger string is 'GOSSAHASH triggered (*importReader).readByte',
repeated 1 times
Review GSHS_LAST_FAIL.0.log for failing run
Finished with GOSSAHASH=
100110010111110
Change-Id: I4eff46ebaf496baa2acedd32e217005cb3ac1c62
Reviewed-on: https://go-review.googlesource.com/29273
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>