Make the variant of __builtin_shufflevector that takes the shuffle indexes as a vector actually usable. Patch by David Neto. PR12465.

llvm-svn: 154128

1 files changed, 35 insertions, 0 deletions

diff --git a/clang/test/CodeGen/builtinshufflevector2.c b/clang/test/CodeGen/builtinshufflevector2.c
new file mode 100644
index 00000000000..faf7a3ec1a1
--- /dev/null
+++ b/clang/test/CodeGen/builtinshufflevector2.c
@@ -0,0 +1,35 @@
+// RUN: %clang -emit-llvm -S -o - %s | FileCheck %s
+
+typedef float float4 __attribute__((ext_vector_type(4)));
+typedef unsigned int uint4 __attribute__((ext_vector_type(4)));
+
+// CHECK: define void @clang_shufflevector_v_v(
+void clang_shufflevector_v_v( float4* A, float4 x, uint4 mask ) {
+// CHECK: [[MASK:%.*]] = and <4 x i32> {{%.*}}, <i32 3, i32 3, i32 3, i32 3>
+// CHECK: [[I:%.*]] = extractelement <4 x i32> [[MASK]], i32 0
+// CHECK: [[E:%.*]] = extractelement <4 x float> [[X:%.*]], i32 [[I]]
+//
+// Here is where ToT Clang code generation makes a mistake.  
+// It uses [[I]] as the insertion index instead of 0.
+// Similarly on the remaining insertelement.
+// CHECK: [[V:%[a-zA-Z0-9._]+]] = insertelement <4 x float> undef, float [[E]], i32 0
+
+// CHECK: [[I:%.*]] = extractelement <4 x i32> [[MASK]], i32 1
+// CHECK: [[E:%.*]] = extractelement <4 x float> [[X]], i32 [[I]]
+// CHECK: [[V:%.*]] = insertelement <4 x float> [[V]], float [[E]], i32 1
+// CHECK: [[I:%.*]] = extractelement <4 x i32> [[MASK]], i32 2
+// CHECK: [[E:%.*]] = extractelement <4 x float> [[X]], i32 [[I]]
+// CHECK: [[V:%.*]] = insertelement <4 x float> [[V]], float [[E]], i32 2
+// CHECK: [[I:%.*]] = extractelement <4 x i32> [[MASK]], i32 3
+// CHECK: [[E:%.*]] = extractelement <4 x float> [[X]], i32 [[I]]
+// CHECK: [[V:%.*]] = insertelement <4 x float> [[V]], float [[E]], i32 3
+// CHECK: store <4 x float> [[V]], <4 x float>* {{%.*}},
+  *A = __builtin_shufflevector( x, mask );
+}
+
+// CHECK: define void @clang_shufflevector_v_v_c(
+void clang_shufflevector_v_v_c( float4* A, float4 x, float4 y, uint4 mask ) {
+// CHECK: [[V:%.*]] = shufflevector <4 x float> {{%.*}}, <4 x float> {{%.*}}, <4 x i32> <i32 0, i32 4, i32 1, i32 5>
+// CHECK: store <4 x float> [[V]], <4 x float>* {{%.*}}
+  *A = __builtin_shufflevector( x, y, 0, 4, 1, 5 );
+}