diff options
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/rtlanal.c | 8 |
2 files changed, 12 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 07814eb..c7c1e86 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,9 +1,12 @@ +2017-05-02 Bin Cheng <bin.cheng@arm.com> + + * rtlanal.c (rtx_cost): Handle TRUNCATE between tieable modes. + 2017-05-02 Xi Ruoyao <ryxi@stu.xidian.edu.cn> * tree.h (EXPR_CILK_SPAWN): Use macro TREE_CHECK2 instead of function tree_check2. - 2017-05-02 Martin Liska <mliska@suse.cz> * doc/gcov.texi: Add missing preposition. diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c index 321363f..f18245f 100644 --- a/gcc/rtlanal.c +++ b/gcc/rtlanal.c @@ -4164,6 +4164,14 @@ rtx_cost (rtx x, machine_mode mode, enum rtx_code outer_code, return COSTS_N_INSNS (2 + factor); break; + case TRUNCATE: + /* If we can tie these modes, make this cheap. */ + if (MODES_TIEABLE_P (mode, GET_MODE (SUBREG_REG (x)))) + { + total = 0; + break; + } + /* FALLTHRU */ default: if (targetm.rtx_costs (x, mode, outer_code, opno, &total, speed)) return total; |