[VectorCombine] Add tests for load/extract scalarization.

Add tests where scalarizing a vector load + extract is profitable.

1 files changed, 307 insertions, 0 deletions

diff --git a/llvm/test/Transforms/VectorCombine/AArch64/load-extractelement-scalarization.ll b/llvm/test/Transforms/VectorCombine/AArch64/load-extractelement-scalarization.ll
new file mode 100644
index 000000000000..c80bc9b3b650
--- /dev/null
+++ b/llvm/test/Transforms/VectorCombine/AArch64/load-extractelement-scalarization.ll
@@ -0,0 +1,307 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -vector-combine -mtriple=arm64-apple-darwinos -S %s | FileCheck %s
+
+define i32 @load_extract_idx_0(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_idx_0(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 3
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 3
+  ret i32 %r
+}
+
+define i32 @load_extract_idx_1(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_idx_1(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 1
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 1
+  ret i32 %r
+}
+
+define i32 @load_extract_idx_2(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_idx_2(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 2
+  ret i32 %r
+}
+
+define i32 @load_extract_idx_3(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_idx_3(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 3
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 3
+  ret i32 %r
+}
+
+define i32 @load_extract_idx_var_i64(<4 x i32>* %x, i64 %idx) {
+; CHECK-LABEL: @load_extract_idx_var_i64(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX:%.*]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i64 %idx
+  ret i32 %r
+}
+
+define i32 @load_extract_idx_var_i32(<4 x i32>* %x, i32 %idx) {
+; CHECK-LABEL: @load_extract_idx_var_i32(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 [[IDX:%.*]]
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 %idx
+  ret i32 %r
+}
+
+declare void @clobber()
+
+define i32 @load_extract_clobber_call_before(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_clobber_call_before(
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  call void @clobber()
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 2
+  ret i32 %r
+}
+
+define i32 @load_extract_clobber_call_between(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_clobber_call_between(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  call void @clobber()
+  %r = extractelement <4 x i32> %lv, i32 2
+  ret i32 %r
+}
+
+define i32 @load_extract_clobber_call_after(<4 x i32>* %x) {
+; CHECK-LABEL: @load_extract_clobber_call_after(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    call void @clobber()
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 2
+  call void @clobber()
+  ret i32 %r
+}
+
+define i32 @load_extract_clobber_store_before(<4 x i32>* %x, i8* %y) {
+; CHECK-LABEL: @load_extract_clobber_store_before(
+; CHECK-NEXT:    store i8 0, i8* [[Y:%.*]], align 1
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  store i8 0, i8* %y
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %r = extractelement <4 x i32> %lv, i32 2
+  ret i32 %r
+}
+
+define i32 @load_extract_clobber_store_between(<4 x i32>* %x, i8* %y) {
+; CHECK-LABEL: @load_extract_clobber_store_between(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    store i8 0, i8* [[Y:%.*]], align 1
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    ret i32 [[R]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  store i8 0, i8* %y
+  %r = extractelement <4 x i32> %lv, i32 2
+  ret i32 %r
+}
+
+define i32 @load_extract_clobber_store_between_limit(<4 x i32>* %x, i8* %y, <8 x i32> %z) {
+; CHECK-LABEL: @load_extract_clobber_store_between_limit(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[Z_0:%.*]] = extractelement <8 x i32> [[Z:%.*]], i32 0
+; CHECK-NEXT:    [[Z_1:%.*]] = extractelement <8 x i32> [[Z]], i32 1
+; CHECK-NEXT:    [[ADD_0:%.*]] = add i32 [[Z_0]], [[Z_1]]
+; CHECK-NEXT:    [[Z_2:%.*]] = extractelement <8 x i32> [[Z]], i32 2
+; CHECK-NEXT:    [[ADD_1:%.*]] = add i32 [[ADD_0]], [[Z_2]]
+; CHECK-NEXT:    [[Z_3:%.*]] = extractelement <8 x i32> [[Z]], i32 3
+; CHECK-NEXT:    [[ADD_2:%.*]] = add i32 [[ADD_1]], [[Z_3]]
+; CHECK-NEXT:    [[Z_4:%.*]] = extractelement <8 x i32> [[Z]], i32 4
+; CHECK-NEXT:    [[ADD_3:%.*]] = add i32 [[ADD_2]], [[Z_4]]
+; CHECK-NEXT:    store i8 0, i8* [[Y:%.*]], align 1
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    [[ADD_4:%.*]] = add i32 [[ADD_3]], [[R]]
+; CHECK-NEXT:    ret i32 [[ADD_4]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %z.0 = extractelement <8 x i32> %z, i32 0
+  %z.1 = extractelement <8 x i32> %z, i32 1
+  %add.0 = add i32 %z.0, %z.1
+  %z.2 = extractelement <8 x i32> %z, i32 2
+  %add.1 = add i32 %add.0, %z.2
+  %z.3 = extractelement <8 x i32> %z, i32 3
+  %add.2 = add i32 %add.1, %z.3
+  %z.4 = extractelement <8 x i32> %z, i32 4
+  %add.3 = add i32 %add.2, %z.4
+  store i8 0, i8* %y
+  %r = extractelement <4 x i32> %lv, i32 2
+  %add.4 = add i32 %add.3, %r
+  ret i32 %add.4
+}
+
+define i32 @load_extract_clobber_store_after_limit(<4 x i32>* %x, i8* %y, <8 x i32> %z) {
+; CHECK-LABEL: @load_extract_clobber_store_after_limit(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[Z_0:%.*]] = extractelement <8 x i32> [[Z:%.*]], i32 0
+; CHECK-NEXT:    [[Z_1:%.*]] = extractelement <8 x i32> [[Z]], i32 1
+; CHECK-NEXT:    [[ADD_0:%.*]] = add i32 [[Z_0]], [[Z_1]]
+; CHECK-NEXT:    [[Z_2:%.*]] = extractelement <8 x i32> [[Z]], i32 2
+; CHECK-NEXT:    [[ADD_1:%.*]] = add i32 [[ADD_0]], [[Z_2]]
+; CHECK-NEXT:    [[Z_3:%.*]] = extractelement <8 x i32> [[Z]], i32 3
+; CHECK-NEXT:    [[ADD_2:%.*]] = add i32 [[ADD_1]], [[Z_3]]
+; CHECK-NEXT:    [[Z_4:%.*]] = extractelement <8 x i32> [[Z]], i32 4
+; CHECK-NEXT:    [[ADD_3:%.*]] = add i32 [[ADD_2]], [[Z_4]]
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 2
+; CHECK-NEXT:    store i8 0, i8* [[Y:%.*]], align 1
+; CHECK-NEXT:    [[ADD_4:%.*]] = add i32 [[ADD_3]], [[R]]
+; CHECK-NEXT:    ret i32 [[ADD_4]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %z.0 = extractelement <8 x i32> %z, i32 0
+  %z.1 = extractelement <8 x i32> %z, i32 1
+  %add.0 = add i32 %z.0, %z.1
+  %z.2 = extractelement <8 x i32> %z, i32 2
+  %add.1 = add i32 %add.0, %z.2
+  %z.3 = extractelement <8 x i32> %z, i32 3
+  %add.2 = add i32 %add.1, %z.3
+  %z.4 = extractelement <8 x i32> %z, i32 4
+  %add.3 = add i32 %add.2, %z.4
+  %r = extractelement <4 x i32> %lv, i32 2
+  store i8 0, i8* %y
+  %add.4 = add i32 %add.3, %r
+  ret i32 %add.4
+}
+
+declare void @use.v4i32(<4 x i32>)
+
+define i32 @load_extract_idx_different_bbs(<4 x i32>* %x, i1 %c) {
+; CHECK-LABEL: @load_extract_idx_different_bbs(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    br i1 [[C:%.*]], label [[THEN:%.*]], label [[ELSE:%.*]]
+; CHECK:       then:
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i32> [[LV]], i32 1
+; CHECK-NEXT:    ret i32 [[R]]
+; CHECK:       else:
+; CHECK-NEXT:    call void @use.v4i32(<4 x i32> [[LV]])
+; CHECK-NEXT:    ret i32 20
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  br i1 %c, label %then, label %else
+
+then:
+  %r = extractelement <4 x i32> %lv, i32 1
+  ret i32 %r
+
+else:
+  call void @use.v4i32(<4 x i32> %lv)
+  ret i32 20
+}
+
+define i31 @load_with_non_power_of_2_element_type(<4 x i31>* %x) {
+; CHECK-LABEL: @load_with_non_power_of_2_element_type(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i31>, <4 x i31>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[R:%.*]] = extractelement <4 x i31> [[LV]], i32 1
+; CHECK-NEXT:    ret i31 [[R]]
+;
+  %lv = load <4 x i31>, <4 x i31>* %x
+  %r = extractelement <4 x i31> %lv, i32 1
+  ret i31 %r
+}
+
+; Scalarizing the load for multiple constant indices may not be profitable.
+define i32 @load_multiple_extracts_with_constant_idx(<4 x i32>* %x) {
+; CHECK-LABEL: @load_multiple_extracts_with_constant_idx(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[SHIFT:%.*]] = shufflevector <4 x i32> [[LV]], <4 x i32> poison, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>
+; CHECK-NEXT:    [[TMP1:%.*]] = add <4 x i32> [[LV]], [[SHIFT]]
+; CHECK-NEXT:    [[RES:%.*]] = extractelement <4 x i32> [[TMP1]], i32 0
+; CHECK-NEXT:    ret i32 [[RES]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %e.0 = extractelement <4 x i32> %lv, i32 0
+  %e.1 = extractelement <4 x i32> %lv, i32 1
+  %res = add i32 %e.0, %e.1
+  ret i32 %res
+}
+
+; Scalarizing may or may not be profitable, depending on the target.
+define i32 @load_multiple_2_with_variable_indices(<4 x i32>* %x, i64 %idx.0, i64 %idx.1) {
+; CHECK-LABEL: @load_multiple_2_with_variable_indices(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[E_0:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_0:%.*]]
+; CHECK-NEXT:    [[E_1:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_1:%.*]]
+; CHECK-NEXT:    [[RES:%.*]] = add i32 [[E_0]], [[E_1]]
+; CHECK-NEXT:    ret i32 [[RES]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %e.0 = extractelement <4 x i32> %lv, i64 %idx.0
+  %e.1 = extractelement <4 x i32> %lv, i64 %idx.1
+  %res = add i32 %e.0, %e.1
+  ret i32 %res
+}
+
+define i32 @load_4_extracts_with_variable_indices_short_vector(<4 x i32>* %x, i64 %idx.0, i64 %idx.1, i64 %idx.2, i64 %idx.3) {
+; CHECK-LABEL: @load_4_extracts_with_variable_indices_short_vector(
+; CHECK-NEXT:    [[LV:%.*]] = load <4 x i32>, <4 x i32>* [[X:%.*]], align 16
+; CHECK-NEXT:    [[E_0:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_0:%.*]]
+; CHECK-NEXT:    [[E_1:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_1:%.*]]
+; CHECK-NEXT:    [[E_2:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_2:%.*]]
+; CHECK-NEXT:    [[E_3:%.*]] = extractelement <4 x i32> [[LV]], i64 [[IDX_3:%.*]]
+; CHECK-NEXT:    [[RES_0:%.*]] = add i32 [[E_0]], [[E_1]]
+; CHECK-NEXT:    [[RES_1:%.*]] = add i32 [[RES_0]], [[E_2]]
+; CHECK-NEXT:    [[RES_2:%.*]] = add i32 [[RES_1]], [[E_3]]
+; CHECK-NEXT:    ret i32 [[RES_2]]
+;
+  %lv = load <4 x i32>, <4 x i32>* %x
+  %e.0 = extractelement <4 x i32> %lv, i64 %idx.0
+  %e.1 = extractelement <4 x i32> %lv, i64 %idx.1
+  %e.2 = extractelement <4 x i32> %lv, i64 %idx.2
+  %e.3 = extractelement <4 x i32> %lv, i64 %idx.3
+  %res.0 = add i32 %e.0, %e.1
+  %res.1 = add i32 %res.0, %e.2
+  %res.2 = add i32 %res.1, %e.3
+  ret i32 %res.2
+}
+
+define i32 @load_multiple_extracts_with_variable_indices_large_vector(<16 x i32>* %x, i64 %idx.0, i64 %idx.1) {
+; CHECK-LABEL: @load_multiple_extracts_with_variable_indices_large_vector(
+; CHECK-NEXT:    [[LV:%.*]] = load <16 x i32>, <16 x i32>* [[X:%.*]], align 64
+; CHECK-NEXT:    [[E_0:%.*]] = extractelement <16 x i32> [[LV]], i64 [[IDX_0:%.*]]
+; CHECK-NEXT:    [[E_1:%.*]] = extractelement <16 x i32> [[LV]], i64 [[IDX_1:%.*]]
+; CHECK-NEXT:    [[RES:%.*]] = add i32 [[E_0]], [[E_1]]
+; CHECK-NEXT:    ret i32 [[RES]]
+;
+  %lv = load <16 x i32>, <16 x i32>* %x
+  %e.0 = extractelement <16 x i32> %lv, i64 %idx.0
+  %e.1 = extractelement <16 x i32> %lv, i64 %idx.1
+  %res = add i32 %e.0, %e.1
+  ret i32 %res
+}