5a4ec5c42b
Only when load-hoisted we can be sure the base pointer is invariant during the SCoP's execution. Most of the time it would be added to the required hoists for the alias checks anyway, except with -polly-ignore-aliasing, -polly-use-runtime-alias-checks=0 or if AliasAnalysis is already sure it doesn't alias with anything (for instance if there is no other pointer to alias with). Two more parts in Polly assume that this load-hoisting took place: - setNewAccessRelation() which contains an assert which tests this. - BlockGenerator which would use to the base ptr from the original code if not load-hoisted (if the access expression is regenerated) Differential Revision: https://reviews.llvm.org/D30694 llvm-svn: 297195
68 lines
2.2 KiB
LLVM
68 lines
2.2 KiB
LLVM
; RUN: opt %loadPolly -basicaa -polly-parallel -polly-parallel-force -polly-invariant-load-hoisting=true -polly-ast -analyze < %s | FileCheck %s -check-prefix=AST
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; RUN: opt %loadPolly -basicaa -polly-parallel -polly-parallel-force -polly-invariant-load-hoisting=true -polly-codegen -S -verify-dom-info < %s | FileCheck %s -check-prefix=IR
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; The interesting part of this test case is the instruction:
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; %tmp = bitcast i8* %call to i64**
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; which is not part of the scop. In the SCEV based code generation not '%tmp',
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; but %call is a parameter of the SCoP and we need to make sure its value is
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; properly forwarded to the subfunction.
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; AST: #pragma omp parallel for
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; AST: for (int c0 = 0; c0 < cols; c0 += 1)
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; AST: Stmt_for_body(c0);
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; AST: if (cols <= 0)
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; AST: Stmt_for_body(0);
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; IR: @foo_polly_subfn
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @foo(i64 %cols, i8* noalias %call) {
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entry:
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%tmp = bitcast i8* %call to i64**
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br label %for.body
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for.body:
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%indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i64*, i64** %tmp, i64 0
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%tmp1 = load i64*, i64** %arrayidx, align 8
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%arrayidx.2 = getelementptr inbounds i64, i64* %tmp1, i64 %indvar
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store i64 1, i64* %arrayidx.2, align 4
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%indvar.next = add nsw i64 %indvar, 1
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%cmp = icmp slt i64 %indvar.next, %cols
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br i1 %cmp, label %for.body, label %end
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end:
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ret void
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}
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; Another variation of this test case, now with even more of the index
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; expression defined outside of the scop.
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; AST: #pragma omp parallel for
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; AST: for (int c0 = 0; c0 < cols; c0 += 1)
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; AST: Stmt_for_body(c0);
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; AST: if (cols <= 0)
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; AST: Stmt_for_body(0);
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; IR: @bar_polly_subfn
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define void @bar(i64 %cols, i8* noalias %call) {
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entry:
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%tmp = bitcast i8* %call to i64**
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%arrayidx = getelementptr inbounds i64*, i64** %tmp, i64 0
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br label %for.body
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for.body:
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%indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
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%tmp1 = load i64*, i64** %arrayidx, align 8
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%arrayidx.2 = getelementptr inbounds i64, i64* %tmp1, i64 %indvar
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store i64 1, i64* %arrayidx.2, align 4
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%indvar.next = add nsw i64 %indvar, 1
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%cmp = icmp slt i64 %indvar.next, %cols
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br i1 %cmp, label %for.body, label %end
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end:
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ret void
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}
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