[X86] Added LSHR cost model tests

There are several dodgy costings due to AVX1 legalizing 256-bit integer vectors that need fixing.

As discussed in D8690. 

llvm-svn: 249983

1 files changed, 400 insertions, 0 deletions

diff --git a/llvm/test/Analysis/CostModel/X86/vshift-lshr-cost.ll b/llvm/test/Analysis/CostModel/X86/vshift-lshr-cost.ll
new file mode 100644
index 00000000000..08b752b778e
--- /dev/null
+++ b/llvm/test/Analysis/CostModel/X86/vshift-lshr-cost.ll
@@ -0,0 +1,400 @@
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=+sse2,-sse4.1 -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=SSE2
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=SSE41
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7-avx -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=AVX
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=core-avx2 -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=AVX2
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=bdver2 -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=XOP -check-prefix=XOPAVX
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=bdver4 -cost-model -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=XOP -check-prefix=XOPAVX2
+
+; Verify the cost of vector logical shift right instructions.
+
+;
+; Variable Shifts
+;
+
+define <2 x i64> @var_shift_v2i64(<2 x i64> %a, <2 x i64> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v2i64':
+; SSE2: Found an estimated cost of 4 for instruction:   %shift
+; SSE41: Found an estimated cost of 4 for instruction:   %shift
+; AVX: Found an estimated cost of 4 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <2 x i64> %a, %b
+  ret <2 x i64> %shift
+}
+
+define <4 x i64> @var_shift_v4i64(<4 x i64> %a, <4 x i64> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v4i64':
+; SSE2: Found an estimated cost of 8 for instruction:   %shift
+; SSE41: Found an estimated cost of 8 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i64> %a, %b
+  ret <4 x i64> %shift
+}
+
+define <4 x i32> @var_shift_v4i32(<4 x i32> %a, <4 x i32> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v4i32':
+; SSE2: Found an estimated cost of 16 for instruction:   %shift
+; SSE41: Found an estimated cost of 16 for instruction:   %shift
+; AVX: Found an estimated cost of 16 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i32> %a, %b
+  ret <4 x i32> %shift
+}
+
+define <8 x i32> @var_shift_v8i32(<8 x i32> %a, <8 x i32> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v8i32':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <8 x i32> %a, %b
+  ret <8 x i32> %shift
+}
+
+define <8 x i16> @var_shift_v8i16(<8 x i16> %a, <8 x i16> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v8i16':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 32 for instruction:   %shift
+; AVX2: Found an estimated cost of 32 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <8 x i16> %a, %b
+  ret <8 x i16> %shift
+}
+
+define <16 x i16> @var_shift_v16i16(<16 x i16> %a, <16 x i16> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v16i16':
+; SSE2: Found an estimated cost of 64 for instruction:   %shift
+; SSE41: Found an estimated cost of 64 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 10 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <16 x i16> %a, %b
+  ret <16 x i16> %shift
+}
+
+define <16 x i8> @var_shift_v16i8(<16 x i8> %a, <16 x i8> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v16i8':
+; SSE2: Found an estimated cost of 26 for instruction:   %shift
+; SSE41: Found an estimated cost of 26 for instruction:   %shift
+; AVX: Found an estimated cost of 26 for instruction:   %shift
+; AVX2: Found an estimated cost of 26 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <16 x i8> %a, %b
+  ret <16 x i8> %shift
+}
+
+define <32 x i8> @var_shift_v32i8(<32 x i8> %a, <32 x i8> %b) {
+; CHECK: 'Cost Model Analysis' for function 'var_shift_v32i8':
+; SSE2: Found an estimated cost of 52 for instruction:   %shift
+; SSE41: Found an estimated cost of 52 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 11 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <32 x i8> %a, %b
+  ret <32 x i8> %shift
+}
+
+;
+; Uniform Variable Shifts
+;
+
+define <2 x i64> @splatvar_shift_v2i64(<2 x i64> %a, <2 x i64> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v2i64':
+; SSE2: Found an estimated cost of 4 for instruction:   %shift
+; SSE41: Found an estimated cost of 4 for instruction:   %shift
+; AVX: Found an estimated cost of 4 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %splat = shufflevector <2 x i64> %b, <2 x i64> undef, <2 x i32> zeroinitializer
+  %shift = lshr <2 x i64> %a, %splat
+  ret <2 x i64> %shift
+}
+
+define <4 x i64> @splatvar_shift_v4i64(<4 x i64> %a, <4 x i64> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v4i64':
+; SSE2: Found an estimated cost of 8 for instruction:   %shift
+; SSE41: Found an estimated cost of 8 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %splat = shufflevector <4 x i64> %b, <4 x i64> undef, <4 x i32> zeroinitializer
+  %shift = lshr <4 x i64> %a, %splat
+  ret <4 x i64> %shift
+}
+
+define <4 x i32> @splatvar_shift_v4i32(<4 x i32> %a, <4 x i32> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v4i32':
+; SSE2: Found an estimated cost of 16 for instruction:   %shift
+; SSE41: Found an estimated cost of 16 for instruction:   %shift
+; AVX: Found an estimated cost of 16 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %splat = shufflevector <4 x i32> %b, <4 x i32> undef, <4 x i32> zeroinitializer
+  %shift = lshr <4 x i32> %a, %splat
+  ret <4 x i32> %shift
+}
+
+define <8 x i32> @splatvar_shift_v8i32(<8 x i32> %a, <8 x i32> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v8i32':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %splat = shufflevector <8 x i32> %b, <8 x i32> undef, <8 x i32> zeroinitializer
+  %shift = lshr <8 x i32> %a, %splat
+  ret <8 x i32> %shift
+}
+
+define <8 x i16> @splatvar_shift_v8i16(<8 x i16> %a, <8 x i16> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v8i16':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 32 for instruction:   %shift
+; AVX2: Found an estimated cost of 32 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %splat = shufflevector <8 x i16> %b, <8 x i16> undef, <8 x i32> zeroinitializer
+  %shift = lshr <8 x i16> %a, %splat
+  ret <8 x i16> %shift
+}
+
+define <16 x i16> @splatvar_shift_v16i16(<16 x i16> %a, <16 x i16> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v16i16':
+; SSE2: Found an estimated cost of 64 for instruction:   %shift
+; SSE41: Found an estimated cost of 64 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 10 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %splat = shufflevector <16 x i16> %b, <16 x i16> undef, <16 x i32> zeroinitializer
+  %shift = lshr <16 x i16> %a, %splat
+  ret <16 x i16> %shift
+}
+
+define <16 x i8> @splatvar_shift_v16i8(<16 x i8> %a, <16 x i8> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v16i8':
+; SSE2: Found an estimated cost of 26 for instruction:   %shift
+; SSE41: Found an estimated cost of 26 for instruction:   %shift
+; AVX: Found an estimated cost of 26 for instruction:   %shift
+; AVX2: Found an estimated cost of 26 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %splat = shufflevector <16 x i8> %b, <16 x i8> undef, <16 x i32> zeroinitializer
+  %shift = lshr <16 x i8> %a, %splat
+  ret <16 x i8> %shift
+}
+
+define <32 x i8> @splatvar_shift_v32i8(<32 x i8> %a, <32 x i8> %b) {
+; CHECK: 'Cost Model Analysis' for function 'splatvar_shift_v32i8':
+; SSE2: Found an estimated cost of 52 for instruction:   %shift
+; SSE41: Found an estimated cost of 52 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 11 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %splat = shufflevector <32 x i8> %b, <32 x i8> undef, <32 x i32> zeroinitializer
+  %shift = lshr <32 x i8> %a, %splat
+  ret <32 x i8> %shift
+}
+
+;
+; Constant Shifts
+;
+
+define <2 x i64> @constant_shift_v2i64(<2 x i64> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v2i64':
+; SSE2: Found an estimated cost of 4 for instruction:   %shift
+; SSE41: Found an estimated cost of 4 for instruction:   %shift
+; AVX: Found an estimated cost of 4 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <2 x i64> %a, <i64 1, i64 7>
+  ret <2 x i64> %shift
+}
+
+define <4 x i64> @constant_shift_v4i64(<4 x i64> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v4i64':
+; SSE2: Found an estimated cost of 8 for instruction:   %shift
+; SSE41: Found an estimated cost of 8 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i64> %a, <i64 1, i64 7, i64 15, i64 31>
+  ret <4 x i64> %shift
+}
+
+define <4 x i32> @constant_shift_v4i32(<4 x i32> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v4i32':
+; SSE2: Found an estimated cost of 16 for instruction:   %shift
+; SSE41: Found an estimated cost of 16 for instruction:   %shift
+; AVX: Found an estimated cost of 16 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i32> %a, <i32 4, i32 5, i32 6, i32 7>
+  ret <4 x i32> %shift
+}
+
+define <8 x i32> @constant_shift_v8i32(<8 x i32> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v8i32':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <8 x i32> %a, <i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
+  ret <8 x i32> %shift
+}
+
+define <8 x i16> @constant_shift_v8i16(<8 x i16> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v8i16':
+; SSE2: Found an estimated cost of 32 for instruction:   %shift
+; SSE41: Found an estimated cost of 32 for instruction:   %shift
+; AVX: Found an estimated cost of 32 for instruction:   %shift
+; AVX2: Found an estimated cost of 32 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <8 x i16> %a, <i16 0, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7>
+  ret <8 x i16> %shift
+}
+
+define <16 x i16> @constant_shift_v16i16(<16 x i16> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v16i16':
+; SSE2: Found an estimated cost of 64 for instruction:   %shift
+; SSE41: Found an estimated cost of 64 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 10 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <16 x i16> %a, <i16 0, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7, i16 0, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7>
+  ret <16 x i16> %shift
+}
+
+define <16 x i8> @constant_shift_v16i8(<16 x i8> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v16i8':
+; SSE2: Found an estimated cost of 26 for instruction:   %shift
+; SSE41: Found an estimated cost of 26 for instruction:   %shift
+; AVX: Found an estimated cost of 26 for instruction:   %shift
+; AVX2: Found an estimated cost of 26 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <16 x i8> %a, <i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7, i8 7, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>
+  ret <16 x i8> %shift
+}
+
+define <32 x i8> @constant_shift_v32i8(<32 x i8> %a) {
+; CHECK: 'Cost Model Analysis' for function 'constant_shift_v32i8':
+; SSE2: Found an estimated cost of 52 for instruction:   %shift
+; SSE41: Found an estimated cost of 52 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 11 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <32 x i8> %a, <i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7, i8 7, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0, i8 0, i8 1, i8 2, i8 3, i8 4, i8 5, i8 6, i8 7, i8 7, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>
+  ret <32 x i8> %shift
+}
+
+;
+; Uniform Constant Shifts
+;
+
+define <2 x i64> @splatconstant_shift_v2i64(<2 x i64> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v2i64':
+; SSE2: Found an estimated cost of 1 for instruction:   %shift
+; SSE41: Found an estimated cost of 1 for instruction:   %shift
+; AVX: Found an estimated cost of 1 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <2 x i64> %a, <i64 7, i64 7>
+  ret <2 x i64> %shift
+}
+
+define <4 x i64> @splatconstant_shift_v4i64(<4 x i64> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v4i64':
+; SSE2: Found an estimated cost of 2 for instruction:   %shift
+; SSE41: Found an estimated cost of 2 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i64> %a, <i64 7, i64 7, i64 7, i64 7>
+  ret <4 x i64> %shift
+}
+
+define <4 x i32> @splatconstant_shift_v4i32(<4 x i32> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v4i32':
+; SSE2: Found an estimated cost of 1 for instruction:   %shift
+; SSE41: Found an estimated cost of 1 for instruction:   %shift
+; AVX: Found an estimated cost of 1 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 2 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <4 x i32> %a, <i32 5, i32 5, i32 5, i32 5>
+  ret <4 x i32> %shift
+}
+
+define <8 x i32> @splatconstant_shift_v8i32(<8 x i32> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v8i32':
+; SSE2: Found an estimated cost of 2 for instruction:   %shift
+; SSE41: Found an estimated cost of 2 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOPAVX: Found an estimated cost of 4 for instruction:   %shift
+; XOPAVX2: Found an estimated cost of 1 for instruction:   %shift
+  %shift = lshr <8 x i32> %a, <i32 5, i32 5, i32 5, i32 5, i32 5, i32 5, i32 5, i32 5>
+  ret <8 x i32> %shift
+}
+
+define <8 x i16> @splatconstant_shift_v8i16(<8 x i16> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v8i16':
+; SSE2: Found an estimated cost of 1 for instruction:   %shift
+; SSE41: Found an estimated cost of 1 for instruction:   %shift
+; AVX: Found an estimated cost of 1 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <8 x i16> %a, <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>
+  ret <8 x i16> %shift
+}
+
+define <16 x i16> @splatconstant_shift_v16i16(<16 x i16> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v16i16':
+; SSE2: Found an estimated cost of 2 for instruction:   %shift
+; SSE41: Found an estimated cost of 2 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 10 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <16 x i16> %a, <i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3, i16 3>
+  ret <16 x i16> %shift
+}
+
+define <16 x i8> @splatconstant_shift_v16i8(<16 x i8> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v16i8':
+; SSE2: Found an estimated cost of 1 for instruction:   %shift
+; SSE41: Found an estimated cost of 1 for instruction:   %shift
+; AVX: Found an estimated cost of 1 for instruction:   %shift
+; AVX2: Found an estimated cost of 1 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = lshr <16 x i8> %a, <i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3>
+  ret <16 x i8> %shift
+}
+
+define <32 x i8> @splatconstant_shift_v32i8(<32 x i8> %a) {
+; CHECK: 'Cost Model Analysis' for function 'splatconstant_shift_v32i8':
+; SSE2: Found an estimated cost of 2 for instruction:   %shift
+; SSE41: Found an estimated cost of 2 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 11 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = lshr <32 x i8> %a, <i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3, i8 3>
+  ret <32 x i8> %shift
+}