8e8d2595da
This patch canonicalizes constant expression GEPs to use i8 source element type, aka ptradd. This is the ConstantFolding equivalent of the InstCombine canonicalization introduced in #68882. I believe all our optimizations working on constant expression GEPs (like GlobalOpt etc) have already been switched to work on offsets, so I don't expect any significant fallout from this change. This is part of: https://discourse.llvm.org/t/rfc-replacing-getelementptr-with-ptradd/68699
35 lines
1.6 KiB
LLVM
35 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt %s -passes=loop-vectorize,instcombine,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -mtriple=x86_64-unknown-linux-gnu -mattr=avx512vl,avx512dq,avx512bw -S | FileCheck %s
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@bytes = global [128 x i8] zeroinitializer, align 16
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; Make sure we end up with vector code for this loop. We used to try to create
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; a VF=64,UF=4 loop, but the scalar trip count is only 128 so
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; the vector loop was dead code leaving only a scalar remainder.
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define zeroext i8 @sum() {
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; CHECK-LABEL: @sum(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <64 x i8>, ptr getelementptr inbounds (i8, ptr @bytes, i64 64), align 1
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <64 x i8>, ptr @bytes, align 1
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; CHECK-NEXT: [[BIN_RDX:%.*]] = add <64 x i8> [[WIDE_LOAD2]], [[WIDE_LOAD]]
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; CHECK-NEXT: [[TMP0:%.*]] = call i8 @llvm.vector.reduce.add.v64i8(<64 x i8> [[BIN_RDX]])
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; CHECK-NEXT: ret i8 [[TMP0]]
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;
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%r.010 = phi i8 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds [128 x i8], ptr @bytes, i64 0, i64 %indvars.iv
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%0 = load i8, ptr %arrayidx, align 1
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%add = add i8 %0, %r.010
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 128
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%add.lcssa = phi i8 [ %add, %for.body ]
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ret i8 %add.lcssa
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}
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