Add suggested test

Author: preames

llvm/test/Transforms/LoopVectorize/RISCV/vplan-vp-select-intrinsics.ll

@@ -20,14 +20,14 @@
  ; IF-EVL-NEXT: Successor(s): ir-bb<scalar.ph>, ir-bb<vector.ph>
 
  ; IF-EVL:      ir-bb<vector.ph>:
- ; IF-EVL-NEXT:   IR   %4 = call i64 @llvm.vscale.i64()
- ; IF-EVL-NEXT:   IR   %5 = mul nuw i64 %4, 4
- ; IF-EVL-NEXT:   IR   %6 = sub i64 %5, 1
- ; IF-EVL-NEXT:   IR   %n.rnd.up = add i64 %N, %6
- ; IF-EVL-NEXT:   IR   %n.mod.vf = urem i64 %n.rnd.up, %5
+ ; IF-EVL-NEXT:   IR   %0 = call i64 @llvm.vscale.i64()
+ ; IF-EVL-NEXT:   IR   %1 = mul nuw i64 %0, 4
+ ; IF-EVL-NEXT:   IR   %2 = sub i64 %1, 1
+ ; IF-EVL-NEXT:   IR   %n.rnd.up = add i64 %N, %2
+ ; IF-EVL-NEXT:   IR   %n.mod.vf = urem i64 %n.rnd.up, %1
  ; IF-EVL-NEXT:   IR   %n.vec = sub i64 %n.rnd.up, %n.mod.vf
- ; IF-EVL-NEXT:   IR   %7 = call i64 @llvm.vscale.i64()
- ; IF-EVL-NEXT:   IR   %8 = mul nuw i64 %7, 4
+ ; IF-EVL-NEXT:   IR   %3 = call i64 @llvm.vscale.i64()
+ ; IF-EVL-NEXT:   IR   %4 = mul nuw i64 %3, 4
  ; IF-EVL-NEXT: Successor(s): vector.body
  ; IF-EVL-EMPTY:
  ; IF-EVL-NEXT: vector.body:

llvm/test/Transforms/LoopVectorize/scalable-predication.ll

@@ -0,0 +1,65 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=loop-vectorize -force-tail-folding-style=data -prefer-predicate-over-epilogue=predicate-dont-vectorize -force-target-supports-scalable-vectors -S < %s | FileCheck %s
+
+; vscale is not guaranteed to be a power of two, so this test (which
+; deliberately doesn't correspond to an in-tree backend since those
+; *do* have vscale as power-of-two) exercises the code required for the
+; minimum iteration check in the non-power-of-two case.
+define void @foo(i32 %val, ptr dereferenceable(1024) %ptr) {
+; CHECK-LABEL: @foo(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP6:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-NEXT:    [[TMP7:%.*]] = mul nuw i64 [[TMP6]], 4
+; CHECK-NEXT:    [[TMP8:%.*]] = icmp ult i64 -257, [[TMP7]]
+; CHECK-NEXT:    br i1 [[TMP8]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-NEXT:    [[TMP1:%.*]] = mul nuw i64 [[TMP0]], 4
+; CHECK-NEXT:    [[TMP2:%.*]] = sub i64 [[TMP1]], 1
+; CHECK-NEXT:    [[N_RND_UP:%.*]] = add i64 256, [[TMP2]]
+; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP1]]
+; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
+; CHECK-NEXT:    [[TMP3:%.*]] = call i64 @llvm.vscale.i64()
+; CHECK-NEXT:    [[TMP4:%.*]] = mul nuw i64 [[TMP3]], 4
+; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX1:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT2:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEXT:    [[ACTIVE_LANE_MASK:%.*]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 [[INDEX1]], i64 256)
+; CHECK-NEXT:    [[INDEX_NEXT2]] = add i64 [[INDEX1]], [[TMP4]]
+; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT2]], [[N_VEC]]
+; CHECK-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    br label [[WHILE_END_LOOPEXIT:%.*]]
+; CHECK:       scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
+; CHECK:       while.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ [[INDEX_NEXT:%.*]], [[WHILE_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
+; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i32, ptr [[PTR:%.*]], i64 [[INDEX]]
+; CHECK-NEXT:    [[LD1:%.*]] = load i32, ptr [[GEP]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nsw i64 [[INDEX]], 1
+; CHECK-NEXT:    [[CMP10:%.*]] = icmp ult i64 [[INDEX_NEXT]], 256
+; CHECK-NEXT:    br i1 [[CMP10]], label [[WHILE_BODY]], label [[WHILE_END_LOOPEXIT]], !llvm.loop [[LOOP3:![0-9]+]]
+; CHECK:       while.end.loopexit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %while.body
+
+while.body:                                       ; preds = %while.body, %entry
+  %index = phi i64 [ %index.next, %while.body ], [ 0, %entry ]
+  %gep = getelementptr i32, ptr %ptr, i64 %index
+  %ld1 = load i32, ptr %gep, align 4
+  %index.next = add nsw i64 %index, 1
+  %cmp10 = icmp ult i64 %index.next, 256
+  br i1 %cmp10, label %while.body, label %while.end.loopexit, !llvm.loop !0
+
+while.end.loopexit:                               ; preds = %while.body
+  ret void
+}
+
+!0 = distinct !{!0, !1, !2, !3, !4}
+!1 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
+!2 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
+!3 = !{!"llvm.loop.interleave.count", i32 1}
+!4 = !{!"llvm.loop.vectorize.width", i32 4}