From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/testsuite/gcc.dg/torture/badshift.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/torture/badshift.c (limited to 'gcc/testsuite/gcc.dg/torture/badshift.c') diff --git a/gcc/testsuite/gcc.dg/torture/badshift.c b/gcc/testsuite/gcc.dg/torture/badshift.c new file mode 100644 index 000000000..7288a3745 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/badshift.c @@ -0,0 +1,29 @@ +/* PR rtl-optimization/20532 */ + +/* { dg-do run } */ +/* { dg-options "" } */ +/* { dg-options "-march=i386" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */ + +/* We used to optimize the DImode shift-by-32 to zero because in combine + we turned: + + (v << 31) + (v << 31) + + into: + + (v * (((HOST_WIDE_INT)1 << 31) + ((HOST_WIDE_INT)1 << 31))) + + With a 32-bit HOST_WIDE_INT, the coefficient overflowed to zero. */ + +unsigned long long int badshift(unsigned long long int v) +{ + return v << 31 << 1; +} + +extern void abort (); + +int main() { + if (badshift (1) == 0) + abort (); + return 0; +} -- cgit v1.2.3