http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46851
Summary: ICE: in compute_affine_dependence, at tree-data-ref.c:3897 with -fcheck-data-deps Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassig...@gcc.gnu.org ReportedBy: zso...@seznam.cz CC: s...@gcc.gnu.org Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu Created attachment 22687 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22687 gcc.dg/autopar/pr39500-2.c Compiler output: $ gcc -O -fcheck-data-deps pr46851.c (Number of distance vectors differ: Banerjee has 1, Omega has 0. Banerjee dist vectors: 100 Omega dist vectors: data dependence relation: (Data Dep: #(Data Ref: # stmt: D.2689_4 = x[D.2688_3]; # ref: x[D.2688_3]; # base_object: x # Access function 0: {100, +, 1}_1 #) #(Data Ref: # stmt: x[i_12] = D.2689_4; # ref: x[i_12]; # base_object: x # Access function 0: {0, +, 1}_1 #) access_fn_A: {100, +, 1}_1 access_fn_B: {0, +, 1}_1 (subscript iterations_that_access_an_element_twice_in_A: [100 + 1 * x_1] last_conflict: 1 iterations_that_access_an_element_twice_in_B: [0 + 1 * x_1] last_conflict: 1 (Subscript distance: 100 ) ) inner loop index: 0 loop nest: (1 ) ) ) pr46851.c: In function 'main': pr46851.c:1:5: internal compiler error: in compute_affine_dependence, at tree-data-ref.c:3897 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. Tested revisions: r167556 - crash 4.5 r166509 - crash 4.4 r166509 - crash I wasn't able to further reduce the testcase.