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llvm-project/llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-interleave.ll
Luke Lau 7250b66240
[VPlan] Create AVL as a phi from TC -> 0 with EVL tail folding (#151481) 
This implements the first half of #151459, by changing the AVL so it's
no longer computed as `trip-count - EVL-based IV`, but instead a
separate scalar phi that is decremented by EVL each iteration.

This shortens the dependency chain for computing the AVL and should
eventually allow us to convert the branch condition to `branch-count
avl-next, 0`.

`simplifyBranchConditionForVFAndUF` had to be updated to prevent a
regression because this introduces a VPPhi in the header block.
2025-08-01 11:00:05 +08:00

140 lines
8.9 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize \
; RUN: -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue \
; RUN: -mtriple=riscv64 -mattr=+v -S < %s | FileCheck --check-prefix=IF-EVL %s
; RUN: opt -passes=loop-vectorize \
; RUN: -prefer-predicate-over-epilogue=scalar-epilogue \
; RUN: -mtriple=riscv64 -mattr=+v -S < %s | FileCheck --check-prefix=NO-VP %s
; FIXME: interleaved accesses are not supported yet with predicated vectorization.
define void @interleave(ptr noalias %a, ptr noalias %b, i64 %N) {
; IF-EVL-LABEL: @interleave(
; IF-EVL-NEXT: entry:
; IF-EVL-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; IF-EVL: vector.ph:
; IF-EVL-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; IF-EVL-NEXT: [[TMP5:%.*]] = mul nuw i64 [[TMP4]], 4
; IF-EVL-NEXT: [[TMP6:%.*]] = sub i64 [[TMP5]], 1
; IF-EVL-NEXT: [[N_RND_UP:%.*]] = add i64 [[N:%.*]], [[TMP6]]
; IF-EVL-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP5]]
; IF-EVL-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; IF-EVL-NEXT: [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
; IF-EVL-NEXT: [[TMP8:%.*]] = mul nuw i64 [[TMP7]], 4
; IF-EVL-NEXT: [[TMP10:%.*]] = call <vscale x 4 x i64> @llvm.stepvector.nxv4i64()
; IF-EVL-NEXT: [[TMP12:%.*]] = mul <vscale x 4 x i64> [[TMP10]], splat (i64 1)
; IF-EVL-NEXT: [[INDUCTION:%.*]] = add <vscale x 4 x i64> zeroinitializer, [[TMP12]]
; IF-EVL-NEXT: br label [[VECTOR_BODY:%.*]]
; IF-EVL: vector.body:
; IF-EVL-NEXT: [[EVL_BASED_IV:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT: [[VEC_IND:%.*]] = phi <vscale x 4 x i64> [ [[INDUCTION]], [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT: [[AVL:%.*]] = phi i64 [ [[N]], [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT: [[TMP11:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 4, i1 true)
; IF-EVL-NEXT: [[TMP13:%.*]] = zext i32 [[TMP11]] to i64
; IF-EVL-NEXT: [[TMP9:%.*]] = mul i64 1, [[TMP13]]
; IF-EVL-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 4 x i64> poison, i64 [[TMP9]], i64 0
; IF-EVL-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 4 x i64> [[BROADCAST_SPLATINSERT1]], <vscale x 4 x i64> poison, <vscale x 4 x i32> zeroinitializer
; IF-EVL-NEXT: [[TMP21:%.*]] = getelementptr inbounds [2 x i32], ptr [[B:%.*]], <vscale x 4 x i64> [[VEC_IND]], i32 0
; IF-EVL-NEXT: [[WIDE_MASKED_GATHER3:%.*]] = call <vscale x 4 x i32> @llvm.vp.gather.nxv4i32.nxv4p0(<vscale x 4 x ptr> align 4 [[TMP21]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; IF-EVL-NEXT: [[TMP23:%.*]] = getelementptr inbounds [2 x i32], ptr [[B]], <vscale x 4 x i64> [[VEC_IND]], i32 1
; IF-EVL-NEXT: [[WIDE_MASKED_GATHER5:%.*]] = call <vscale x 4 x i32> @llvm.vp.gather.nxv4i32.nxv4p0(<vscale x 4 x ptr> align 4 [[TMP23]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; IF-EVL-NEXT: [[TMP26:%.*]] = add nsw <vscale x 4 x i32> [[WIDE_MASKED_GATHER5]], [[WIDE_MASKED_GATHER3]]
; IF-EVL-NEXT: [[TMP18:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[EVL_BASED_IV]]
; IF-EVL-NEXT: call void @llvm.vp.store.nxv4i32.p0(<vscale x 4 x i32> [[TMP26]], ptr align 4 [[TMP18]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; IF-EVL-NEXT: [[TMP14:%.*]] = zext i32 [[TMP11]] to i64
; IF-EVL-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP14]], [[EVL_BASED_IV]]
; IF-EVL-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP14]]
; IF-EVL-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i64> [[VEC_IND]], [[BROADCAST_SPLAT2]]
; IF-EVL-NEXT: [[TMP15:%.*]] = icmp eq i64 [[INDEX_EVL_NEXT]], [[N]]
; IF-EVL-NEXT: br i1 [[TMP15]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; IF-EVL: middle.block:
; IF-EVL-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
; IF-EVL: scalar.ph:
; IF-EVL-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ]
; IF-EVL-NEXT: br label [[FOR_BODY:%.*]]
; IF-EVL: for.body:
; IF-EVL-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; IF-EVL-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [2 x i32], ptr [[B]], i64 [[IV]], i32 0
; IF-EVL-NEXT: [[TMP16:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; IF-EVL-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [2 x i32], ptr [[B]], i64 [[IV]], i32 1
; IF-EVL-NEXT: [[TMP17:%.*]] = load i32, ptr [[ARRAYIDX2]], align 4
; IF-EVL-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP17]], [[TMP16]]
; IF-EVL-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]]
; IF-EVL-NEXT: store i32 [[ADD]], ptr [[ARRAYIDX4]], align 4
; IF-EVL-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; IF-EVL-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; IF-EVL-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; IF-EVL: for.cond.cleanup:
; IF-EVL-NEXT: ret void
;
; NO-VP-LABEL: @interleave(
; NO-VP-NEXT: entry:
; NO-VP-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT: [[TMP1:%.*]] = mul nuw i64 [[TMP0]], 4
; NO-VP-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], [[TMP1]]
; NO-VP-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; NO-VP: vector.ph:
; NO-VP-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 4
; NO-VP-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP3]]
; NO-VP-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; NO-VP-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT: [[TMP8:%.*]] = mul nuw i64 [[TMP4]], 4
; NO-VP-NEXT: br label [[VECTOR_BODY:%.*]]
; NO-VP: vector.body:
; NO-VP-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; NO-VP-NEXT: [[TMP13:%.*]] = getelementptr inbounds [2 x i32], ptr [[B:%.*]], i64 [[INDEX]], i32 0
; NO-VP-NEXT: [[WIDE_VEC1:%.*]] = load <vscale x 8 x i32>, ptr [[TMP13]], align 4
; NO-VP-NEXT: [[STRIDED_VEC2:%.*]] = call { <vscale x 4 x i32>, <vscale x 4 x i32> } @llvm.vector.deinterleave2.nxv8i32(<vscale x 8 x i32> [[WIDE_VEC1]])
; NO-VP-NEXT: [[TMP18:%.*]] = extractvalue { <vscale x 4 x i32>, <vscale x 4 x i32> } [[STRIDED_VEC2]], 0
; NO-VP-NEXT: [[TMP19:%.*]] = extractvalue { <vscale x 4 x i32>, <vscale x 4 x i32> } [[STRIDED_VEC2]], 1
; NO-VP-NEXT: [[TMP21:%.*]] = add nsw <vscale x 4 x i32> [[TMP19]], [[TMP18]]
; NO-VP-NEXT: [[TMP22:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDEX]]
; NO-VP-NEXT: store <vscale x 4 x i32> [[TMP21]], ptr [[TMP22]], align 4
; NO-VP-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP8]]
; NO-VP-NEXT: [[TMP28:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; NO-VP-NEXT: br i1 [[TMP28]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; NO-VP: middle.block:
; NO-VP-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; NO-VP-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; NO-VP: scalar.ph:
; NO-VP-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; NO-VP-NEXT: br label [[FOR_BODY:%.*]]
; NO-VP: for.body:
; NO-VP-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; NO-VP-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [2 x i32], ptr [[B]], i64 [[IV]], i32 0
; NO-VP-NEXT: [[TMP29:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; NO-VP-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds [2 x i32], ptr [[B]], i64 [[IV]], i32 1
; NO-VP-NEXT: [[TMP30:%.*]] = load i32, ptr [[ARRAYIDX2]], align 4
; NO-VP-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP30]], [[TMP29]]
; NO-VP-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]]
; NO-VP-NEXT: store i32 [[ADD]], ptr [[ARRAYIDX4]], align 4
; NO-VP-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; NO-VP-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; NO-VP-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; NO-VP: for.cond.cleanup:
; NO-VP-NEXT: ret void
;
entry:
br label %for.body
for.body:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%arrayidx = getelementptr inbounds [2 x i32], ptr %b, i64 %iv, i32 0
%0 = load i32, ptr %arrayidx, align 4
%arrayidx2 = getelementptr inbounds [2 x i32], ptr %b, i64 %iv, i32 1
%1 = load i32, ptr %arrayidx2, align 4
%add = add nsw i32 %1, %0
%arrayidx4 = getelementptr inbounds i32, ptr %a, i64 %iv
store i32 %add, ptr %arrayidx4, align 4
%iv.next = add nuw nsw i64 %iv, 1
%exitcond.not = icmp eq i64 %iv.next, %N
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body, !llvm.loop !0
for.cond.cleanup:
ret void
}
!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.vectorize.enable", i1 true}
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