diff options
Diffstat (limited to 'gcc/loop-iv.c')
| -rw-r--r-- | gcc/loop-iv.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c index 2523963f36d..3723dbd463a 100644 --- a/gcc/loop-iv.c +++ b/gcc/loop-iv.c @@ -1337,13 +1337,26 @@ simple_rhs_p (rtx rhs) case MINUS: op0 = XEXP (rhs, 0); op1 = XEXP (rhs, 1); - /* Allow reg + const sets only. */ - if (REG_P (op0) && !HARD_REGISTER_P (op0) && CONSTANT_P (op1)) - return true; - if (REG_P (op1) && !HARD_REGISTER_P (op1) && CONSTANT_P (op0)) - return true; + /* Allow reg + const and reg + reg. */ + if (!(REG_P (op0) && !HARD_REGISTER_P (op0)) + && !CONSTANT_P (op0)) + return false; + if (!(REG_P (op1) && !HARD_REGISTER_P (op1)) + && !CONSTANT_P (op1)) + return false; - return false; + return true; + + case ASHIFT: + op0 = XEXP (rhs, 0); + op1 = XEXP (rhs, 1); + /* Allow reg << const. */ + if (!(REG_P (op0) && !HARD_REGISTER_P (op0))) + return false; + if (!CONSTANT_P (op1)) + return false; + + return true; default: return false; |
