112 lines
4 KiB
LLVM
112 lines
4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes='require<phi-values>,gvn' -S < %s | FileCheck %s
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declare noalias ptr @malloc(i64)
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; Detecting that %s is fully redundant should let us detect that %w is partially
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; redundant.
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define void @fn1(ptr noalias %start, ptr %width, i32 %h) {
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; CHECK-LABEL: @fn1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CALL:%.*]] = tail call noalias ptr @malloc(i64 1024)
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; CHECK-NEXT: store ptr [[CALL]], ptr [[START:%.*]], align 8
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; CHECK-NEXT: br label [[PREHEADER:%.*]]
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; CHECK: preheader:
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 1, [[H:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[PREHEADER_BODY_CRIT_EDGE:%.*]], label [[EXIT:%.*]]
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; CHECK: preheader.body_crit_edge:
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; CHECK-NEXT: [[W_PRE:%.*]] = load i32, ptr [[WIDTH:%.*]], align 8
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; CHECK-NEXT: br label [[BODY:%.*]]
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; CHECK: body:
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; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[PREHEADER_BODY_CRIT_EDGE]] ], [ [[J_NEXT:%.*]], [[BODY]] ]
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; CHECK-NEXT: store i32 0, ptr [[CALL]], align 4
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; CHECK-NEXT: [[J_NEXT]] = add nuw nsw i32 [[J]], 1
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; CHECK-NEXT: [[CMP3:%.*]] = icmp slt i32 [[J_NEXT]], [[W_PRE]]
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; CHECK-NEXT: br i1 [[CMP3]], label [[BODY]], label [[PREHEADER]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%call = tail call noalias ptr @malloc(i64 1024)
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store ptr %call, ptr %start, align 8
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br label %preheader
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preheader:
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%cmp = icmp slt i32 1, %h
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br i1 %cmp, label %body, label %exit
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body:
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%j = phi i32 [ 0, %preheader ], [ %j.next, %body ]
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%s = load ptr, ptr %start, align 8
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store i32 0, ptr %s, align 4
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%j.next = add nuw nsw i32 %j, 1
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%w = load i32, ptr %width, align 8
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%cmp3 = icmp slt i32 %j.next, %w
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br i1 %cmp3, label %body, label %preheader
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exit:
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ret void
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}
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; %s is fully redundant but has more than one available value. Detecting that
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; %w is partially redundant requires alias analysis that can analyze those
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; values.
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define void @fn2(ptr noalias %start, ptr %width, i32 %h, i32 %arg) {
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; CHECK-LABEL: @fn2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CALL:%.*]] = tail call noalias ptr @malloc(i64 1024)
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 [[ARG:%.*]], 0
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; CHECK-NEXT: br i1 [[CMP1]], label [[IF:%.*]], label [[ELSE:%.*]]
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; CHECK: if:
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; CHECK-NEXT: store ptr [[CALL]], ptr [[START:%.*]], align 8
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; CHECK-NEXT: br label [[PREHEADER:%.*]]
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; CHECK: else:
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, ptr [[CALL]], i32 [[ARG]]
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; CHECK-NEXT: store ptr [[GEP]], ptr [[START]], align 8
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; CHECK-NEXT: br label [[PREHEADER]]
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; CHECK: preheader:
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; CHECK-NEXT: [[S:%.*]] = phi ptr [ [[S]], [[BODY:%.*]] ], [ [[GEP]], [[ELSE]] ], [ [[CALL]], [[IF]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 1, [[H:%.*]]
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; CHECK-NEXT: br i1 [[CMP]], label [[PREHEADER_BODY_CRIT_EDGE:%.*]], label [[EXIT:%.*]]
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; CHECK: preheader.body_crit_edge:
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; CHECK-NEXT: [[W_PRE:%.*]] = load i32, ptr [[WIDTH:%.*]], align 8
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; CHECK-NEXT: br label [[BODY]]
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; CHECK: body:
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; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[PREHEADER_BODY_CRIT_EDGE]] ], [ [[J_NEXT:%.*]], [[BODY]] ]
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; CHECK-NEXT: store i32 0, ptr [[S]], align 4
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; CHECK-NEXT: [[J_NEXT]] = add nuw nsw i32 [[J]], 1
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; CHECK-NEXT: [[CMP3:%.*]] = icmp slt i32 [[J_NEXT]], [[W_PRE]]
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; CHECK-NEXT: br i1 [[CMP3]], label [[BODY]], label [[PREHEADER]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%call = tail call noalias ptr @malloc(i64 1024)
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%cmp1 = icmp slt i32 %arg, 0
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br i1 %cmp1, label %if, label %else
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if:
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store ptr %call, ptr %start, align 8
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br label %preheader
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else:
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%gep = getelementptr inbounds i32, ptr %call, i32 %arg
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store ptr %gep, ptr %start, align 8
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br label %preheader
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preheader:
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%cmp = icmp slt i32 1, %h
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br i1 %cmp, label %body, label %exit
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body:
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%j = phi i32 [ 0, %preheader ], [ %j.next, %body ]
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%s = load ptr, ptr %start, align 8
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store i32 0, ptr %s, align 4
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%j.next = add nuw nsw i32 %j, 1
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%w = load i32, ptr %width, align 8
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%cmp3 = icmp slt i32 %j.next, %w
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br i1 %cmp3, label %body, label %preheader
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exit:
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ret void
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}
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