http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60694
Bug ID: 60694
Summary: Gcc-4.2.4 hangs during compilation of the attached
test
Product: gcc
Version: 4.2.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: niva at niisi dot msk.ru
Created attachment 32471
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32471&action=edit
The test file.
Native gcc-4.1.2 and gcc-4.2.4 hang during compilation of the attached test.
It seems that some analysis pass in cc1 exponentially depends on
the size of expressions being analyzed. When I reduce the
number of "basic blocks" in the loop the compilation time
varies as follows:
$ time gcc -O3 -S smuladd16.c
real 0m0.431s
user 0m0.069s
sys 0m0.014s
$ time gcc -O3 -S smuladd24.c
real 0m7.041s
user 0m7.011s
sys 0m0.013s
$ time gcc -O3 -S smuladd28.c
real 1m50.267s
user 1m49.829s
sys 0m0.109s
I checked that later versions of gcc (4.4.6, 4.7.3, gcc-4.9.0)
behave normally. But actually we are using a cross-compiler based on
gcc-4.1.2 with plenty of changes and we cannot migrate to
to a later gcc version quickly.
Is there a patch which solves the problem?
