r244613 - in /trunk/gcc: ChangeLog expr.c tests...

[rearnsha@gcc.gnu.org]

Author: rearnsha
Date: Thu Jan 19 10:35:38 2017
New Revision: 244613

URL: https://gcc.gnu.org/viewcvs?rev=244613&root=gcc&view=rev
Log:
    [expand] Fix for PR rtl-optimization/79121 incorrect expansion of extend plus left shift
    
    When generating a shift from an extended value moving from one to two
    machine registers, the type of the right shift is for the most
    significant word should be determined by the signedness of the inner
    type, not the signedness of the result type.
    
    gcc:
        PR rtl-optimization/79121
        * expr.c (expand_expr_real_2, case LSHIFT_EXPR): Look at the signedness
        of the inner type when shifting an extended value.
    
    gcc/testsuite:
        * gcc.c-torture/execute/pr79121.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr79121.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/testsuite/ChangeLog