Mercurial > hg > CbC > CbC_gcc
diff gcc/tree-scalar-evolution.c @ 47:3bfb6c00c1e0
update it from 4.4.2 to 4.4.3.
| author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Sun, 07 Feb 2010 17:44:34 +0900 |
| parents | 58ad6c70ea60 |
| children | 77e2b8dfacca |
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--- a/gcc/tree-scalar-evolution.c Sun Feb 07 17:43:48 2010 +0900 +++ b/gcc/tree-scalar-evolution.c Sun Feb 07 17:44:34 2010 +0900 @@ -2186,8 +2186,19 @@ if (CHREC_LEFT (chrec) != op0 || CHREC_RIGHT (chrec) != op1) { + unsigned var = CHREC_VARIABLE (chrec); + + /* When the instantiated stride or base has an evolution in an + innermost loop, return chrec_dont_know, as this is not a + valid SCEV representation. In the reduced testcase for + PR40281 we would have {0, +, {1, +, 1}_2}_1 that has no + meaning. */ + if ((tree_is_chrec (op0) && CHREC_VARIABLE (op0) > var) + || (tree_is_chrec (op1) && CHREC_VARIABLE (op1) > var)) + return chrec_dont_know; + op1 = chrec_convert_rhs (chrec_type (op0), op1, NULL); - chrec = build_polynomial_chrec (CHREC_VARIABLE (chrec), op0, op1); + chrec = build_polynomial_chrec (var, op0, op1); } return chrec;