[X86] Added ASHR cost model tests

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

As discussed in D8690.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249981 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/CostModel/X86/vshift-ashr-cost.ll b/test/Analysis/CostModel/X86/vshift-ashr-cost.ll
new file mode 100644 (file)
index 0000000..cb1aa60
--- /dev/null
+++ b/test/Analysis/CostModel/X86/vshift-ashr-cost.ll
@@ -0,0 +1,392 @@
+; 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 arithmetic 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 12 for instruction:   %shift
+; SSE41: Found an estimated cost of 12 for instruction:   %shift
+; AVX: Found an estimated cost of 12 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 24 for instruction:   %shift
+; SSE41: Found an estimated cost of 24 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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 = ashr <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 = ashr <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 = ashr <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 = ashr <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 54 for instruction:   %shift
+; SSE41: Found an estimated cost of 54 for instruction:   %shift
+; AVX: Found an estimated cost of 54 for instruction:   %shift
+; AVX2: Found an estimated cost of 54 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 108 for instruction:   %shift
+; SSE41: Found an estimated cost of 108 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 24 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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 12 for instruction:   %shift
+; SSE41: Found an estimated cost of 12 for instruction:   %shift
+; AVX: Found an estimated cost of 12 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %splat = shufflevector <2 x i64> %b, <2 x i64> undef, <2 x i32> zeroinitializer
+  %shift = ashr <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 24 for instruction:   %shift
+; SSE41: Found an estimated cost of 24 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %splat = shufflevector <4 x i64> %b, <4 x i64> undef, <4 x i32> zeroinitializer
+  %shift = ashr <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 = ashr <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 = ashr <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 = ashr <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 = ashr <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 54 for instruction:   %shift
+; SSE41: Found an estimated cost of 54 for instruction:   %shift
+; AVX: Found an estimated cost of 54 for instruction:   %shift
+; AVX2: Found an estimated cost of 54 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 = ashr <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 108 for instruction:   %shift
+; SSE41: Found an estimated cost of 108 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 24 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 = ashr <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 12 for instruction:   %shift
+; SSE41: Found an estimated cost of 12 for instruction:   %shift
+; AVX: Found an estimated cost of 12 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 24 for instruction:   %shift
+; SSE41: Found an estimated cost of 24 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 4 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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 = ashr <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 = ashr <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 = ashr <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 = ashr <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 54 for instruction:   %shift
+; SSE41: Found an estimated cost of 54 for instruction:   %shift
+; AVX: Found an estimated cost of 54 for instruction:   %shift
+; AVX2: Found an estimated cost of 54 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 108 for instruction:   %shift
+; SSE41: Found an estimated cost of 108 for instruction:   %shift
+; AVX: Found an estimated cost of 2 for instruction:   %shift
+; AVX2: Found an estimated cost of 24 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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 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 4 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 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 4 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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 = ashr <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 = ashr <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 = ashr <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 = ashr <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 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 4 for instruction:   %shift
+; XOP: Found an estimated cost of 2 for instruction:   %shift
+  %shift = ashr <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 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 24 for instruction:   %shift
+; XOP: Found an estimated cost of 4 for instruction:   %shift
+  %shift = ashr <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
+}