From 1bc5aee63eb72b341f506ad058502cd0361f0d10 Mon Sep 17 00:00:00 2001 From: Ben Cheng Date: Tue, 25 Mar 2014 22:37:19 -0700 Subject: Initial checkin of GCC 4.9.0 from trunk (r208799). Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba --- gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c | 47 +++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c (limited to 'gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c') diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c new file mode 100644 index 000000000..a65d8a16d --- /dev/null +++ b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c @@ -0,0 +1,47 @@ +/* { dg-do run } */ +/* { dg-options "-O2" } */ +/* { dg-require-effective-target int32plus } */ + +struct tree_decl +{ + union tree_decl_u1 { + int f; + long i; + struct tree_decl_u1_a { + unsigned int align : 24; + unsigned int off_align : 8; + } a; + } u1; +}; + +extern void abort (void); + +unsigned int +assemble_variable (struct tree_decl decl) +{ + unsigned int align; + + align = decl.u1.a.align; + + if (align > (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62))) + align = (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62)); + + /* VRP should not be propagating 0 to the RHS of this assignment. + But it was erroneously applying a cast operation between types of + different precision. align is an unsigned int with range [0, + 0x4000000] but the .align field holds only 24 bits. So the cast + was returning a [0, 0] range. */ + decl.u1.a.align = align; + + return decl.u1.a.align; +} + +main () +{ + struct tree_decl decl; + decl.u1.a.align = 13; + unsigned int x = assemble_variable (decl); + if (x == 0) + abort (); + return 0; +} -- cgit v1.2.3