[Bug tree-optimization/71261] [7 Regression] Trunk GCC hangs on knl and broadwell targets

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71261

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 38581
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38581&action=edit
incomplete patch

Attached my work-in progress to remove bool fixup in favor of improving bool
pattern recognition.

Still has some testsuite ICEs:

FAIL: c-c++-common/cilk-plus/AN/if_test.c  -O2 -ftree-vectorize -fcilkplus
(internal compiler error)
...
FAIL: gcc.c-torture/compile/pr53410-1.c   -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions  (internal compiler
error)
FAIL: gcc.c-torture/execute/921013-1.c   -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions  (test for excess
errors)
FAIL: gcc.dg/pr50310-1.c (internal compiler error)
FAIL: gcc.dg/pr50310-1.c (test for excess errors)
WARNING: gcc.dg/pr50310-1.c compilation failed to produce executable
FAIL: gcc.dg/pr64087.c (internal compiler error)
FAIL: gcc.dg/pr64087.c (test for excess errors)
FAIL: gcc.dg/pr70026.c (internal compiler error)
FAIL: gcc.dg/pr70026.c (test for excess errors)
...
(and some more)