131 lines
4.3 KiB
LLVM
131 lines
4.3 KiB
LLVM
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; RUN: opt -basic-aa -loop-load-elim -S < %s | FileCheck %s
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; RUN: opt -basic-aa -loop-load-elim -pgso -S < %s -enable-new-pm=0 | FileCheck %s -check-prefix=PGSO
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; RUN: opt -aa-pipeline=basic-aa -passes='require<profile-summary>,function(loop-load-elim)' -S < %s | FileCheck %s -check-prefix=PGSO
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; RUN: opt -basic-aa -loop-load-elim -pgso=false -S < %s | FileCheck %s -check-prefix=NPGSO
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; When optimizing for size don't eliminate in this loop because the loop would
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; have to be versioned first because A and C may alias.
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;
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; for (unsigned i = 0; i < 100; i++) {
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; A[i+1] = B[i] + 2;
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; C[i] = A[i] * 2;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK-LABEL: @f(
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define void @f(i32* %A, i32* %B, i32* %C, i64 %N) optsize {
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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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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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%Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
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%Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%b = load i32, i32* %Bidx, align 4
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%a_p1 = add i32 %b, 2
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store i32 %a_p1, i32* %Aidx_next, align 4
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%a = load i32, i32* %Aidx, align 4
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; CHECK: %c = mul i32 %a, 2
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%c = mul i32 %a, 2
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store i32 %c, i32* %Cidx, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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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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ret void
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}
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; Same loop but with noalias on %A and %C. In this case load-eliminate even
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; with -Os.
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; CHECK-LABEL: @g(
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define void @g(i32* noalias %A, i32* %B, i32* noalias %C, i64 %N) optsize {
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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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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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%Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
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%Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%b = load i32, i32* %Bidx, align 4
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%a_p1 = add i32 %b, 2
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store i32 %a_p1, i32* %Aidx_next, align 4
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%a = load i32, i32* %Aidx, align 4
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; CHECK: %c = mul i32 %store_forwarded, 2
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%c = mul i32 %a, 2
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store i32 %c, i32* %Cidx, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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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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ret void
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}
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; PGSO-LABEL: @f_pgso(
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; NPGSO-LABEL: @f_pgso(
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define void @f_pgso(i32* %A, i32* %B, i32* %C, i64 %N) !prof !14 {
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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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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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%Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
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%Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%b = load i32, i32* %Bidx, align 4
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%a_p1 = add i32 %b, 2
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store i32 %a_p1, i32* %Aidx_next, align 4
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%a = load i32, i32* %Aidx, align 4
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; PGSO: %c = mul i32 %a, 2
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; NPGSO-NOT: %c = mul i32 %a, 2
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%c = mul i32 %a, 2
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store i32 %c, i32* %Cidx, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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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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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"ProfileSummary", !1}
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!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
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!2 = !{!"ProfileFormat", !"InstrProf"}
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!3 = !{!"TotalCount", i64 10000}
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!4 = !{!"MaxCount", i64 10}
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!5 = !{!"MaxInternalCount", i64 1}
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!6 = !{!"MaxFunctionCount", i64 1000}
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!7 = !{!"NumCounts", i64 3}
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!8 = !{!"NumFunctions", i64 3}
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!9 = !{!"DetailedSummary", !10}
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!10 = !{!11, !12, !13}
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!11 = !{i32 10000, i64 100, i32 1}
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!12 = !{i32 999000, i64 100, i32 1}
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!13 = !{i32 999999, i64 1, i32 2}
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!14 = !{!"function_entry_count", i64 0}
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