forked from OSchip/llvm-project
104 lines
3.5 KiB
LLVM
104 lines
3.5 KiB
LLVM
; RUN: opt -loop-load-elim -S < %s | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes=loop-load-elim -S < %s | FileCheck %s
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target datalayout = "e-m:o-i32:64-f80:128-n8:16:32:64-S128"
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; TODO
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; Make sure loop-load-elimination triggers for a loop with uncomputable
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; backedge-taken counts when no runtime checks are required.
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define void @load_elim_no_runtime_checks(i32* noalias %A, i32* noalias %B, i32* noalias %C, i32 %N) {
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; CHECK-LABEL: load_elim_no_runtime_checks
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %for.body
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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 i32 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
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%Aidx_next = getelementptr inbounds i32, i32* %A, i32 %indvars.iv.next
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%Bidx = getelementptr inbounds i32, i32* %B, i32 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i32 %indvars.iv
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%Aidx = getelementptr inbounds i32, i32* %A, i32 %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 1
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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 i32 %indvars.iv.next, %a
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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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; Make sure loop-load-elimination triggers for a loop with uncomputable
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; backedge-taken counts when no runtime checks are required.
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define void @load_elim_wrapping_runtime_checks(i32* noalias %A, i32* noalias %B, i32* noalias %C, i32 %N) {
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; CHECK-LABEL: @load_elim_wrapping_runtime_checks
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %for.body
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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 i32 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%indvars.iv.next = add i32 %indvars.iv, 1
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%Aidx_next = getelementptr inbounds i32, i32* %A, i32 %indvars.iv.next
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%Bidx = getelementptr inbounds i32, i32* %B, i32 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i32 %indvars.iv
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%Aidx = getelementptr inbounds i32, i32* %A, i32 %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 1
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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 i32 %indvars.iv.next, %a
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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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; Make sure we do not crash when dealing with uncomputable backedge-taken counts
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; and a variable distance between accesses.
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define void @uncomputable_btc_crash(i8* %row, i32 %filter, i32* noalias %exits) local_unnamed_addr #0 {
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; CHECK-LABEL: @uncomputable_btc_crash
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; CHECK-NEXT: entry:
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; CHECK-NEXT: getelementptr
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; CHECK-NEXT: br label %loop
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;
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entry:
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%add.ptr = getelementptr inbounds i8, i8* %row, i32 %filter
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br label %loop
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
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%add.ptr.gep = getelementptr i8, i8* %add.ptr, i32 %iv
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%row.gep = getelementptr i8, i8* %row, i32 %iv
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%gep.1 = getelementptr i8, i8* %add.ptr.gep, i32 0
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%gep.2 = getelementptr i8, i8* %row.gep, i32 0
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%l = load i8, i8* %gep.2, align 1
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store i8 %l, i8* %gep.1, align 1
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%iv.next = add i32 %iv, 8
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%exit.gep = getelementptr i32, i32* %exits, i32 %iv
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%lv = load i32, i32* %exit.gep
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%c = icmp eq i32 %lv, 120
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br i1 %c, label %exit, label %loop
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exit:
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ret void
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}
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