obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

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.

1 files changed, 35 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/mips/loongson-shift-count-truncated-1.c b/gcc/testsuite/gcc.target/mips/loongson-shift-count-truncated-1.c
new file mode 100644
index 000000000..be52cf7de
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/loongson-shift-count-truncated-1.c
@@ -0,0 +1,35 @@
+/* Test case for SHIFT_COUNT_TRUNCATED on Loongson.  */
+
+/* { dg-do run } */
+/* loongson.h does not handle or check for MIPS16ness.  There doesn't
+   seem any good reason for it to, given that the Loongson processors
+   do not support MIPS16.  */
+/* { dg-options "isa=loongson -mhard-float -mno-mips16 -O1" } */
+
+#include "loongson.h"
+#include <assert.h>
+
+typedef union { int32x2_t v; int32_t a[2]; } int32x2_encap_t;
+
+void
+main1 (int shift)
+{
+  int32x2_encap_t s;
+  int32x2_encap_t r;
+
+  s.a[0] = 0xffffffff;
+  s.a[1] = 0xffffffff;
+  /* Loongson SIMD use low-order 7 bits to specify the shift amount.
+     Thus V2SI << 0x40 == 0.  The below expression 'shift & 0x3f' will be
+     mis-optimized as 'shift', if SHIFT_COUNT_TRUNCATED is nonzero.  */
+  r.v = psllw_s (s.v, (shift & 0x3f));
+  assert (r.a[0] == 0xffffffff);
+  assert (r.a[1] == 0xffffffff);
+}
+
+int
+main (void)
+{
+  main1 (0x40);
+  return 0;
+}