[InstCombine] Add test for insertelementinsts with constants.

Added a tests that shows that several insertelementinsts with constant
indexes/data are not folded into a single shuffleinst.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280474 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/vector_insertelt_shuffle.ll

@@ -0,0 +1,77 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define<4 x float> @foo(<4 x float> %x) {
+  %ins1 = insertelement<4 x float> %x, float 1.0, i32 1
+  %ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
+  ret<4 x float> %ins2
+}
+
+; FIXME: insertelements should fold to shuffle
+; CHECK-LABEL: @foo
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 1
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
+; CHECK-NEXT: ret <4 x float> %
+
+define<4 x float> @bar(<4 x float> %x, float %a) {
+  %ins1 = insertelement<4 x float> %x, float %a, i32 1
+  %ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
+  ret<4 x float> %ins2
+}
+
+; CHECK-LABEL: @bar
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float %{{.+}}, i32 1
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
+; CHECK-NEXT: ret <4 x float> %
+
+define<4 x float> @baz(<4 x float> %x, i32 %a) {
+  %ins1 = insertelement<4 x float> %x, float 1.0, i32 1
+  %ins2 = insertelement<4 x float> %ins1, float 2.0, i32 %a
+  ret<4 x float> %ins2
+}
+
+; CHECK-LABEL: @baz
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 1
+; CHECK-NEXT: insertelement <4 x float> %ins1, float 2.000000e+00, i32 %
+; CHECK-NEXT: ret <4 x float> %
+
+define<4 x float> @bazz(<4 x float> %x, i32 %a) {
+  %ins1 = insertelement<4 x float> %x, float 1.0, i32 3
+  %ins2 = insertelement<4 x float> %ins1, float 5.0, i32 %a
+  %ins3 = insertelement<4 x float> %ins2, float 3.0, i32 2
+  %ins4 = insertelement<4 x float> %ins3, float 1.0, i32 1
+  %ins5 = insertelement<4 x float> %ins4, float 2.0, i32 2
+  %ins6 = insertelement<4 x float> %ins5, float 7.0, i32 %a
+  ret<4 x float> %ins6
+}
+
+; FIXME: insertelements should fold to shuffle
+; CHECK-LABEL: @bazz
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 3
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 5.000000e+00, i32 %
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 1
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 7.000000e+00, i32 %
+; CHECK-NEXT: ret <4 x float> %
+
+define<4 x float> @bazzz(<4 x float> %x) {
+  %ins1 = insertelement<4 x float> %x, float 1.0, i32 5
+  %ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
+  ret<4 x float> %ins2
+}
+
+; CHECK-LABEL: @bazzz
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
+; CHECK-NEXT: ret <4 x float> %
+
+define<4 x float> @bazzzz(<4 x float> %x) {
+  %ins1 = insertelement<4 x float> %x, float 1.0, i32 undef
+  %ins2 = insertelement<4 x float> %ins1, float 2.0, i32 2
+  ret<4 x float> %ins2
+}
+
+; CHECK-LABEL: @bazzzz
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 1.000000e+00, i32 undef
+; CHECK-NEXT: insertelement <4 x float> %{{.+}}, float 2.000000e+00, i32 2
+; CHECK-NEXT: ret <4 x float> %
+