r239157 - in /trunk/gcc: ChangeLog testsuite/Ch...

[ppalka@gcc.gnu.org]

Author: ppalka
Date: Fri Aug  5 00:07:16 2016
New Revision: 239157

URL: https://gcc.gnu.org/viewcvs?rev=239157&root=gcc&view=rev
Log:
Teach VRP to truncate the case ranges of a switch

gcc/ChangeLog:

	* tree-vrp.c (simplify_switch_using_ranges): Try to truncate
	the case label ranges that partially overlap with OP's value
	range.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/vrp107.c: New test.
	* gcc.dg/tree-ssa/vrp108.c: New test.
	* gcc.dg/tree-ssa/vrp109.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp107.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp108.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp109.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c