eaf48dd9b0
Try to simplify BranchOnCount to `BranchOnCond true` if TC <= UF * VF. This is an alternative to D121899 which simplifies the VPlan directly instead of doing so late in code-gen. The potential benefit of doing this in VPlan is that this may help cost-modeling in the future. The reason this is done in prepareToExecute at the moment is that a single plan may be used for multiple VFs/UFs. There are further simplifications that can be applied as follow ups: 1. Replace inductions with constants 2. Replace vector region with regular block. Fixes #55354. Depends on D126679. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D126680
42 lines
2.1 KiB
LLVM
42 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt %s -loop-vectorize -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -mtriple=x86_64-unknown-linux-gnu -mattr=avx512vl,avx512dq,avx512bw -S | FileCheck %s
|
|
|
|
@bytes = global [128 x i8] zeroinitializer, align 16
|
|
|
|
; Make sure we end up with vector code for this loop. We used to try to create
|
|
; a VF=64,UF=4 loop, but the scalar trip count is only 128 so
|
|
; the vector loop was dead code leaving only a scalar remainder.
|
|
define zeroext i8 @sum() {
|
|
; CHECK-LABEL: @sum(
|
|
; CHECK-NEXT: iter.check:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds [128 x i8], [128 x i8]* @bytes, i64 0, i64 0
|
|
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[TMP0]] to <64 x i8>*
|
|
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <64 x i8>, <64 x i8>* [[TMP1]], align 16
|
|
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, i8* [[TMP0]], i64 64
|
|
; CHECK-NEXT: [[TMP3:%.*]] = bitcast i8* [[TMP2]] to <64 x i8>*
|
|
; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <64 x i8>, <64 x i8>* [[TMP3]], align 16
|
|
; CHECK-NEXT: [[TMP4:%.*]] = add <64 x i8> [[WIDE_LOAD]], zeroinitializer
|
|
; CHECK-NEXT: [[TMP5:%.*]] = add <64 x i8> [[WIDE_LOAD2]], zeroinitializer
|
|
; CHECK-NEXT: [[INDEX_NEXT:%.*]] = add nuw i64 0, 128
|
|
; CHECK-NEXT: [[BIN_RDX:%.*]] = add <64 x i8> [[TMP5]], [[TMP4]]
|
|
; CHECK-NEXT: [[TMP6:%.*]] = call i8 @llvm.vector.reduce.add.v64i8(<64 x i8> [[BIN_RDX]])
|
|
; CHECK-NEXT: ret i8 [[TMP6]]
|
|
;
|
|
entry:
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %for.body, %entry
|
|
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
|
%r.010 = phi i8 [ 0, %entry ], [ %add, %for.body ]
|
|
%arrayidx = getelementptr inbounds [128 x i8], [128 x i8]* @bytes, i64 0, i64 %indvars.iv
|
|
%0 = load i8, i8* %arrayidx, align 1
|
|
%add = add i8 %0, %r.010
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%exitcond = icmp eq i64 %indvars.iv.next, 128
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end: ; preds = %for.body
|
|
%add.lcssa = phi i8 [ %add, %for.body ]
|
|
ret i8 %add.lcssa
|
|
}
|