diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index c470655..d476bf0 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5049,6 +5049,14 @@ simplify_if_then_else (x) simplify_shift_const (NULL_RTX, ASHIFT, mode, gen_lowpart_for_combine (mode, XEXP (cond, 0)), i); + /* (IF_THEN_ELSE (NE REG 0) (0) (8)) is REG for nonzero_bits (REG) == 8. */ + if (true_code == NE && XEXP (cond, 1) == const0_rtx + && false_rtx == const0_rtx && GET_CODE (true_rtx) == CONST_INT + && (INTVAL (true_rtx) & GET_MODE_MASK (mode)) + == nonzero_bits (XEXP (cond, 0), mode) + && (i = exact_log2 (INTVAL (true_rtx) & GET_MODE_MASK (mode))) >= 0) + return XEXP (cond, 0); + return x; } |