bd84ce8931
Up to now ZoneAlgo considered array elements access by something else than a LoadInst or StoreInst as not analyzable. This patch removes that restriction by using the unknown ValInst to describe the written content, repectively the element type's null value in case of memset. Differential Revision: https://reviews.llvm.org/D37362 llvm-svn: 312630
61 lines
1.3 KiB
LLVM
61 lines
1.3 KiB
LLVM
; RUN: opt %loadPolly -polly-optree -analyze < %s | FileCheck %s -match-full-lines
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;
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; Rematerialize a load in the presence of a non-store WRITE access.
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;
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; for (int j = 0; j < n; j += 1) {
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; bodyA:
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; double val = B[j];
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;
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; bodyB:
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; A[j] = val;
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;
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; bodyC:
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; memset(A, 0, 16);
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; memset(B, 0, 16);
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; }
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;
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declare void @llvm.memset.p0f64.i64(double* nocapture, i8, i64, i32, i1)
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define void @func(i32 %n, double* noalias nonnull %A, double* noalias nonnull %B) {
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entry:
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br label %for
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for:
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%j = phi i32 [0, %entry], [%j.inc, %inc]
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%j.cmp = icmp slt i32 %j, %n
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br i1 %j.cmp, label %bodyA, label %exit
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bodyA:
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%B_idx = getelementptr inbounds double, double* %B, i32 %j
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%val = load double, double* %B_idx
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br label %bodyB
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bodyB:
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%A_idx = getelementptr inbounds double, double* %A, i32 %j
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store double %val, double* %A_idx
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br label %bodyC
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bodyC:
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call void @llvm.memset.p0f64.i64(double* %A, i8 0, i64 16, i32 1, i1 false)
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call void @llvm.memset.p0f64.i64(double* %B, i8 0, i64 16, i32 1, i1 false)
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br label %inc
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inc:
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%j.inc = add nuw nsw i32 %j, 1
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br label %for
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exit:
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br label %return
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return:
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ret void
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}
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; CHECK: Statistics {
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; CHECK: Known loads forwarded: 1
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; CHECK: Operand trees forwarded: 1
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; CHECK: Statements with forwarded operand trees: 1
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; CHECK: }
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