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llvm-project/llvm/test/Transforms/LoopVectorize/pr37248.ll
David Sherwood 1d9775f684 [LV] Change VPLane::getAsRuntimeExpr to use constant 64-bit indices (#193206) 
The canonical form preferred by instcombine is to use 64-bit values for
the index when it is a constant. We should try to do the same where
possible in the loop vectoriser as this reduces churn in the compiler.

It also makes other work easier, such as removing extra unnecessary
passes on the RUN line in the test directory which I plan to do
afterwards.
2026-04-22 11:33:42 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "scalar.ph:" --version 5
; RUN: opt -passes='loop-vectorize' -force-vector-width=2 -S < %s | FileCheck %s
;
; Forcing VF=2 to trigger vector code gen
;
; This is a test case that let's vectorizer's code gen to generate
; more than one BasicBlocks in the loop body (emulated masked scatter)
; for those targets that do not support masked scatter. Broadcast
; code generation was previously dependent on loop body being
; a single basic block and this test case exposed incorrect code gen
; resulting in an assert in IL verification.
;
@a = external global [2 x i16], align 1
define void @f1(ptr noalias %b, i1 %c, i32 %start) {
; CHECK-LABEL: define void @f1(
; CHECK-SAME: ptr noalias [[B:%.*]], i1 [[C:%.*]], i32 [[START:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START]], 1
; CHECK-NEXT: [[SMIN1:%.*]] = call i32 @llvm.smin.i32(i32 [[START]], i32 1)
; CHECK-NEXT: [[TMP1:%.*]] = sub i32 [[TMP0]], [[SMIN1]]
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP1]], 2
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
; CHECK: [[VECTOR_SCEVCHECK]]:
; CHECK-NEXT: [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[START]], i32 1)
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[START]], [[SMIN]]
; CHECK-NEXT: [[TMP3:%.*]] = trunc i32 [[START]] to i16
; CHECK-NEXT: [[TMP4:%.*]] = trunc i32 [[TMP2]] to i16
; CHECK-NEXT: [[TMP5:%.*]] = sub i16 [[TMP3]], [[TMP4]]
; CHECK-NEXT: [[TMP6:%.*]] = icmp sgt i16 [[TMP5]], [[TMP3]]
; CHECK-NEXT: [[TMP8:%.*]] = icmp ugt i32 [[TMP2]], 65535
; CHECK-NEXT: [[TMP9:%.*]] = or i1 [[TMP6]], [[TMP8]]
; CHECK-NEXT: br i1 [[TMP9]], label %[[SCALAR_PH]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP1]], 2
; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP1]], [[N_MOD_VF]]
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <2 x i1> poison, i1 [[C]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <2 x i1> [[BROADCAST_SPLATINSERT]], <2 x i1> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP10:%.*]] = sub i32 [[START]], [[N_VEC]]
; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[BROADCAST_SPLAT]], i64 0
; CHECK-NEXT: [[TMP12:%.*]] = xor i1 [[TMP11]], true
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_STORE_CONTINUE3:.*]] ]
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i32 [[START]], [[INDEX]]
; CHECK-NEXT: [[TMP13:%.*]] = trunc i32 [[OFFSET_IDX]] to i16
; CHECK-NEXT: br i1 [[TMP12]], label %[[PRED_STORE_IF:.*]], label %[[PRED_STORE_CONTINUE:.*]]
; CHECK: [[PRED_STORE_IF]]:
; CHECK-NEXT: store i32 10, ptr [[B]], align 1
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE]]
; CHECK: [[PRED_STORE_CONTINUE]]:
; CHECK-NEXT: br i1 [[TMP12]], label %[[PRED_STORE_IF2:.*]], label %[[PRED_STORE_CONTINUE3]]
; CHECK: [[PRED_STORE_IF2]]:
; CHECK-NEXT: store i32 10, ptr [[B]], align 1
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE3]]
; CHECK: [[PRED_STORE_CONTINUE3]]:
; CHECK-NEXT: [[TMP15:%.*]] = getelementptr inbounds [2 x i16], ptr @a, i16 0, i16 [[TMP13]]
; CHECK-NEXT: [[TMP17:%.*]] = getelementptr inbounds i16, ptr [[TMP15]], i64 -1
; CHECK-NEXT: store <2 x i16> zeroinitializer, ptr [[TMP17]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP18]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP1]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], [[EXIT:label %.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
;
entry:
br label %loop.header
loop.header:
%iv = phi i32 [ %start, %entry ], [ %iv.next, %loop.latch ]
br i1 %c, label %loop.latch, label %else
else:
store i32 10, ptr %b, align 1
br label %loop.latch
loop.latch:
%t = trunc i32 %iv to i16
%arrayidx = getelementptr inbounds [2 x i16], ptr @a, i16 0, i16 %t
store i16 0, ptr %arrayidx, align 1
%iv.next = add nsw i32 %iv, -1
%cmp = icmp sgt i32 %iv, 1
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
define void @f2(ptr noalias %b, i1 %c, i32 %start) {
; CHECK-LABEL: define void @f2(
; CHECK-SAME: ptr noalias [[B:%.*]], i1 [[C:%.*]], i32 [[START:%.*]]) {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START]], 1
; CHECK-NEXT: [[SMIN1:%.*]] = call i32 @llvm.smin.i32(i32 [[START]], i32 1)
; CHECK-NEXT: [[TMP1:%.*]] = sub i32 [[TMP0]], [[SMIN1]]
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[TMP1]], 2
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_SCEVCHECK:.*]]
; CHECK: [[VECTOR_SCEVCHECK]]:
; CHECK-NEXT: [[SMIN:%.*]] = call i32 @llvm.smin.i32(i32 [[START]], i32 1)
; CHECK-NEXT: [[TMP2:%.*]] = sub i32 [[START]], [[SMIN]]
; CHECK-NEXT: [[TMP3:%.*]] = trunc i32 [[START]] to i16
; CHECK-NEXT: [[TMP4:%.*]] = trunc i32 [[TMP2]] to i16
; CHECK-NEXT: [[TMP5:%.*]] = sub i16 [[TMP3]], [[TMP4]]
; CHECK-NEXT: [[TMP6:%.*]] = icmp sgt i16 [[TMP5]], [[TMP3]]
; CHECK-NEXT: [[TMP8:%.*]] = icmp ugt i32 [[TMP2]], 65535
; CHECK-NEXT: [[TMP9:%.*]] = or i1 [[TMP6]], [[TMP8]]
; CHECK-NEXT: br i1 [[TMP9]], label %[[SCALAR_PH]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP1]], 2
; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP1]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP10:%.*]] = sub i32 [[START]], [[N_VEC]]
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = sub i32 [[START]], [[INDEX]]
; CHECK-NEXT: [[TMP11:%.*]] = trunc i32 [[OFFSET_IDX]] to i16
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr inbounds [2 x i16], ptr @a, i16 0, i16 [[TMP11]]
; CHECK-NEXT: [[TMP14:%.*]] = getelementptr inbounds i16, ptr [[TMP12]], i64 -1
; CHECK-NEXT: store <2 x i16> zeroinitializer, ptr [[TMP14]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
; CHECK-NEXT: [[TMP15:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP15]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[TMP1]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], [[EXIT:label %.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
;
entry:
br label %loop.header
loop.header:
%iv = phi i32 [ %start, %entry ], [ %iv.next, %loop.latch ]
br i1 %c, label %loop.latch, label %else
else:
%1 = load i32, ptr %b, align 1
br label %loop.latch
loop.latch:
%2 = trunc i32 %iv to i16
%arrayidx = getelementptr inbounds [2 x i16], ptr @a, i16 0, i16 %2
store i16 0, ptr %arrayidx, align 1
%iv.next = add nsw i32 %iv, -1
%cmp = icmp sgt i32 %iv, 1
br i1 %cmp, label %loop.header, label %exit
exit:
ret void
}
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