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[Bug tree-optimization/21266] New: verify_ssa failed

$ cat minlc.c
void minlc(float *a, int n)
    int i;
    float mv = a[0];
    for (i=1; i<n; i++)
        if(a[i] < mv)
            mv = a[i];
$ gcc -O2 -ftree-vectorize -ftree-vectorizer-verbose=3 -S minlc.c
minlc.c: In function 'minlc':
minlc.c:2: error: Definition in block 2 follows the use
for SSA_NAME: i_13 in statement:
mv_1 = n_7 > i_13 ? mv_12 : mv_20;
minlc.c:2: internal compiler error: verify_ssa failed.
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:> for instructions.
$ gcc -v
Using built-in specs.
Target: ia64-unknown-linux-gnu
Configured with: ../gcc-4.1-20050424/configure --prefix=/home/zfkts --enable-
Thread model: posix
gcc version 4.1.0 20050424 (experimental)

           Summary: verify_ssa failed
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tkoenig at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: ia64-unknown-linux-gnu

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