diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index fd38488..d088031 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5895,6 +5895,13 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest, || XEXP (temp, 1) != XEXP (x, 0))))) return temp; } + + /* Canonicalize x + x into x << 1. */ + if (GET_MODE_CLASS (mode) == MODE_INT + && rtx_equal_p (XEXP (x, 0), XEXP (x, 1)) + && !side_effects_p (XEXP (x, 0))) + return simplify_gen_binary (ASHIFT, mode, XEXP (x, 0), const1_rtx); + break; case MINUS: |