[mips][msa] Build all the tests in little and big endian modes and correct an incorrect test.

Summary:
This patch (correctly) breaks some MSA tests by exposing the cases when
SelectionDAG::getConstant() produces illegal types. These have been temporarily
marked XFAIL and the XFAIL flag will be removed when
SelectionDAG::getConstant() is fixed.

There are three categories of failure:
* Immediate instructions are not selected in one endian mode.
* Immediates used in ldi.[bhwd] must be different according to endianness.
  (this only affects cases where the 'wrong' ldi is used to load the correct
   bitpattern. E.g. (bitcast:v2i64 (build_vector:v4i32 ...)))
* Non-immediate instructions that rely on immediates affected by the
  previous two categories as part of their match pattern.
  For example, the bset match pattern is the vector equivalent of
  'ws | (1 << wt)'.

One test needed correcting to expect different output depending on whether big
or little endian was in use. This test was
test/CodeGen/Mips/msa/basic_operations.ll and experiences the second category
of failure shown above. The little endian version of this test is named
basic_operations_little.ll and will be merged back into basic_operations.ll in
a follow up commit now that FileCheck supports multiple check prefixes.

Reviewers: bkramer, jacksprat, dsanders

Reviewed By: dsanders

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1972

llvm-svn: 194806

1 files changed, 107 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Mips/msa/endian.ll b/llvm/test/CodeGen/Mips/msa/endian.ll
new file mode 100644
index 00000000000..44d1925f1cf
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/msa/endian.ll
@@ -0,0 +1,107 @@
+; RUN: llc -march=mips -mattr=+msa,+fp64 < %s | FileCheck -check-prefix=BIGENDIAN %s
+; RUN: llc -march=mipsel -mattr=+msa,+fp64 < %s | FileCheck -check-prefix=LITENDIAN %s
+
+@v16i8 = global <16 x i8> <i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>
+@v8i16 = global <8 x i16> <i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0>
+@v4i32 = global <4 x i32> <i32 0, i32 0, i32 0, i32 0>
+@v2i64 = global <2 x i64> <i64 0, i64 0>
+
+define void @const_v16i8() nounwind {
+  ; LITENDIAN: .byte 0
+  ; LITENDIAN: .byte 1
+  ; LITENDIAN: .byte 2
+  ; LITENDIAN: .byte 3
+  ; LITENDIAN: .byte 4
+  ; LITENDIAN: .byte 5
+  ; LITENDIAN: .byte 6
+  ; LITENDIAN: .byte 7
+  ; LITENDIAN: .byte 8
+  ; LITENDIAN: .byte 9
+  ; LITENDIAN: .byte 10
+  ; LITENDIAN: .byte 11
+  ; LITENDIAN: .byte 12
+  ; LITENDIAN: .byte 13
+  ; LITENDIAN: .byte 14
+  ; LITENDIAN: .byte 15
+  ; LITENDIAN: const_v16i8:
+  ; BIGENDIAN: .byte 0
+  ; BIGENDIAN: .byte 1
+  ; BIGENDIAN: .byte 2
+  ; BIGENDIAN: .byte 3
+  ; BIGENDIAN: .byte 4
+  ; BIGENDIAN: .byte 5
+  ; BIGENDIAN: .byte 6
+  ; BIGENDIAN: .byte 7
+  ; BIGENDIAN: .byte 8
+  ; BIGENDIAN: .byte 9
+  ; BIGENDIAN: .byte 10
+  ; BIGENDIAN: .byte 11
+  ; BIGENDIAN: .byte 12
+  ; BIGENDIAN: .byte 13
+  ; BIGENDIAN: .byte 14
+  ; BIGENDIAN: .byte 15
+  ; BIGENDIAN: const_v16i8:
+
+  store volatile <16 x i8> <i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7, i8 8, i8 9, i8 10, i8 11, i8 12, i8 13, i8 14, i8 15>, <16 x i8>*@v16i8
+
+  ret void
+}
+
+define void @const_v8i16() nounwind {
+  ; LITENDIAN: .2byte 0
+  ; LITENDIAN: .2byte 1
+  ; LITENDIAN: .2byte 2
+  ; LITENDIAN: .2byte 3
+  ; LITENDIAN: .2byte 4
+  ; LITENDIAN: .2byte 5
+  ; LITENDIAN: .2byte 6
+  ; LITENDIAN: .2byte 7
+  ; LITENDIAN: const_v8i16:
+  ; BIGENDIAN: .2byte 0
+  ; BIGENDIAN: .2byte 1
+  ; BIGENDIAN: .2byte 2
+  ; BIGENDIAN: .2byte 3
+  ; BIGENDIAN: .2byte 4
+  ; BIGENDIAN: .2byte 5
+  ; BIGENDIAN: .2byte 6
+  ; BIGENDIAN: .2byte 7
+  ; BIGENDIAN: const_v8i16:
+
+  store volatile <8 x i16> <i16 0, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7>, <8 x i16>*@v8i16
+
+  ret void
+}
+
+define void @const_v4i32() nounwind {
+  ; LITENDIAN: .4byte 0
+  ; LITENDIAN: .4byte 1
+  ; LITENDIAN: .4byte 2
+  ; LITENDIAN: .4byte 3
+  ; LITENDIAN: const_v4i32:
+  ; BIGENDIAN: .4byte 0
+  ; BIGENDIAN: .4byte 1
+  ; BIGENDIAN: .4byte 2
+  ; BIGENDIAN: .4byte 3
+  ; BIGENDIAN: const_v4i32:
+
+  store volatile <4 x i32> <i32 0, i32 1, i32 2, i32 3>, <4 x i32>*@v4i32
+
+  ret void
+}
+
+define void @const_v2i64() nounwind {
+  ; LITENDIAN: .4byte 1
+  ; LITENDIAN: .4byte 0
+  ; LITENDIAN: .4byte 2
+  ; LITENDIAN: .4byte 0
+  ; LITENDIAN: const_v2i64:
+  ; BIGENDIAN: .4byte 0
+  ; BIGENDIAN: .4byte 1
+  ; BIGENDIAN: .4byte 0
+  ; BIGENDIAN: .4byte 2
+  ; BIGENDIAN: const_v2i64:
+
+  store volatile <2 x i64> <i64 1, i64 2>, <2 x i64>*@v2i64
+
+  ret void
+}