DSE: pre-commit tests for scalable vectors

[artagnon]

As AliasAnalysis now has support for scalable sizes, add tests to DeadStoreElimination covering the scalable vectors case, in preparation to extend it.

[llvmbot]

@llvm/pr-subscribers-llvm-transforms

Author: Ramkumar Ramachandra (artagnon)

Changes

As AliasAnalysis now has support for scalable sizes, add tests to DeadStoreElimination covering the scalable vectors case, in preparation to extend it.

---

Full diff: https://github.com/llvm/llvm-project/pull/110669.diff

2 Files Affected:

• (modified) llvm/test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll (+53-3)
• (modified) llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll (+52)

diff --git a/llvm/test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll b/llvm/test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll
index fbab350008f4ee..c2f7adde7a22ee 100644
--- a/llvm/test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/offsetted-overlapping-stores.ll
@@ -47,6 +47,29 @@ bb:
   ret void
 }
 
+define void @ScalableVectorTestFullyOverlapping(ptr %arg, i32 %i) {
+; CHECK-LABEL: @ScalableVectorTestFullyOverlapping(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[I7:%.*]] = add nuw nsw i32 [[I:%.*]], 1
+; CHECK-NEXT:    [[I8:%.*]] = zext i32 [[I7]] to i64
+; CHECK-NEXT:    [[I9:%.*]] = getelementptr inbounds float, ptr [[ARG:%.*]], i64 [[I8]]
+; CHECK-NEXT:    store float 0.000000e+00, ptr [[I9]], align 4
+; CHECK-NEXT:    [[I2:%.*]] = zext i32 [[I]] to i64
+; CHECK-NEXT:    [[I3:%.*]] = getelementptr inbounds float, ptr [[ARG]], i64 [[I2]]
+; CHECK-NEXT:    store <vscale x 2 x float> zeroinitializer, ptr [[I3]], align 16
+; CHECK-NEXT:    ret void
+;
+bb:
+  %i7 = add nuw nsw i32 %i, 1
+  %i8 = zext i32 %i7 to i64
+  %i9 = getelementptr inbounds float, ptr %arg, i64 %i8
+  store float 0.0, ptr %i9, align 4
+  %i2 = zext i32 %i to i64
+  %i3 = getelementptr inbounds float, ptr %arg, i64 %i2
+  store <vscale x 2 x float> zeroinitializer, ptr %i3, align 16
+  ret void
+}
+
 define void @ArrayTestPartiallyOverlapping(i64 %0) {
 ;
 ; The DSE pass will not kill the store because the overlap is partial
@@ -55,9 +78,9 @@ define void @ArrayTestPartiallyOverlapping(i64 %0) {
 ; CHECK-LABEL: @ArrayTestPartiallyOverlapping(
 ; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[TMP0:%.*]], 10
 ; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds [0 x i8], ptr @BUFFER, i64 0, i64 [[TMP2]]
-; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[TMP0]], 15
-; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds [0 x i8], ptr @BUFFER, i64 0, i64 [[TMP5]]
-; CHECK-NEXT:    store i32 1, ptr [[TMP6]], align 4
+; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[TMP0]], 15
+; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds [0 x i8], ptr @BUFFER, i64 0, i64 [[TMP4]]
+; CHECK-NEXT:    store i32 1, ptr [[TMP5]], align 4
 ; CHECK-NEXT:    store i64 0, ptr [[TMP3]], align 4
 ; CHECK-NEXT:    ret void
 ;
@@ -97,3 +120,30 @@ bb:
   ret void
 }
 
+define void @ScalableVectorTestPartiallyOverlapping(ptr %arg, i32 %i) {
+;
+; The DSE pass will not kill the store because the overlap is partial
+; and won't fully clobber the original store.
+;
+; CHECK-LABEL: @ScalableVectorTestPartiallyOverlapping(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    [[I2:%.*]] = zext i32 [[I:%.*]] to i64
+; CHECK-NEXT:    [[I3:%.*]] = getelementptr inbounds float, ptr [[ARG:%.*]], i64 [[I2]]
+; CHECK-NEXT:    store <vscale x 2 x float> zeroinitializer, ptr [[I3]], align 16
+; CHECK-NEXT:    [[I5:%.*]] = add nuw nsw i32 [[I]], 1
+; CHECK-NEXT:    [[I6:%.*]] = zext i32 [[I5]] to i64
+; CHECK-NEXT:    [[I7:%.*]] = getelementptr inbounds float, ptr [[ARG]], i64 [[I6]]
+; CHECK-NEXT:    store <vscale x 2 x float> zeroinitializer, ptr [[I7]], align 16
+; CHECK-NEXT:    ret void
+;
+bb:
+  %i2 = zext i32 %i to i64
+  %i3 = getelementptr inbounds float, ptr %arg, i64 %i2
+  store <vscale x 2 x float> zeroinitializer, ptr %i3, align 16
+  %i5 = add nuw nsw i32 %i, 1
+  %i6 = zext i32 %i5 to i64
+  %i7 = getelementptr inbounds float, ptr %arg, i64 %i6
+  store <vscale x 2 x float> zeroinitializer, ptr %i7, align 16
+  ret void
+}
+
diff --git a/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll b/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
index c9a0943de8cd98..ae203dfba7ddc1 100644
--- a/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
+++ b/llvm/test/Transforms/DeadStoreElimination/stores-of-existing-values.ll
@@ -655,3 +655,55 @@ exit:
   call void @use(ptr %p) argmemonly
   ret void
 }
+
+define void @scalable_scalable_redundant_store(ptr %ptr) {
+; CHECK-LABEL: @scalable_scalable_redundant_store(
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[PTR:%.*]], i64 2
+; CHECK-NEXT:    store <vscale x 2 x i64> zeroinitializer, ptr [[GEP]], align 16
+; CHECK-NEXT:    store <vscale x 4 x i64> zeroinitializer, ptr [[PTR]], align 32
+; CHECK-NEXT:    ret void
+;
+  %gep = getelementptr i64, ptr %ptr, i64 2
+  store <vscale x 2 x i64> zeroinitializer, ptr %gep
+  store <vscale x 4 x i64> zeroinitializer, ptr %ptr
+  ret void
+}
+
+define void @scalable_fixed_redundant_store(ptr %ptr) {
+; CHECK-LABEL: @scalable_fixed_redundant_store(
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[PTR:%.*]], i64 2
+; CHECK-NEXT:    store <2 x i64> zeroinitializer, ptr [[GEP]], align 16
+; CHECK-NEXT:    store <vscale x 4 x i64> zeroinitializer, ptr [[PTR]], align 32
+; CHECK-NEXT:    ret void
+;
+  %gep = getelementptr i64, ptr %ptr, i64 2
+  store <2 x i64> zeroinitializer, ptr %gep
+  store <vscale x 4 x i64> zeroinitializer, ptr %ptr
+  ret void
+}
+
+define void @fixed_scalable_redundant_store(ptr %ptr) {
+; CHECK-LABEL: @fixed_scalable_redundant_store(
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[PTR:%.*]], i64 2
+; CHECK-NEXT:    store <vscale x 2 x i64> zeroinitializer, ptr [[GEP]], align 16
+; CHECK-NEXT:    store <128 x i64> zeroinitializer, ptr [[PTR]], align 1024
+; CHECK-NEXT:    ret void
+;
+  %gep = getelementptr i64, ptr %ptr, i64 2
+  store <vscale x 2 x i64> zeroinitializer, ptr %gep
+  store <128 x i64> zeroinitializer, ptr %ptr
+  ret void
+}
+
+define void @scalable_scalable_neg(ptr %ptr) {
+; CHECK-LABEL: @scalable_scalable_neg(
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[PTR:%.*]], i64 8
+; CHECK-NEXT:    store <vscale x 4 x i64> zeroinitializer, ptr [[GEP]], align 32
+; CHECK-NEXT:    store <vscale x 2 x i64> zeroinitializer, ptr [[PTR]], align 16
+; CHECK-NEXT:    ret void
+;
+  %gep = getelementptr i64, ptr %ptr, i64 8
+  store <vscale x 4 x i64> zeroinitializer, ptr %gep
+  store <vscale x 2 x i64> zeroinitializer, ptr %ptr
+  ret void
+}