51 lines
2.0 KiB
LLVM
51 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=indvars < %s | FileCheck %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
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target triple = "x86_64-unknown-linux-gnu"
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; Make sure we don't branch by poison here.
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define void @test(i32 %start) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1
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; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[START]] to i64
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: backedge:
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: loop:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[TMP1]], [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
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; CHECK-NEXT: [[INDVARS:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
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; CHECK-NEXT: [[LOOP_EXIT_COND:%.*]] = icmp slt i32 [[TMP0]], 11
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; CHECK-NEXT: br i1 [[LOOP_EXIT_COND]], label [[EXIT:%.*]], label [[STUCK_PREHEADER:%.*]]
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; CHECK: stuck.preheader:
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; CHECK-NEXT: br label [[STUCK:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[INDVARS]], [[LOOP]] ]
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; CHECK-NEXT: ret void
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; CHECK: stuck:
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; CHECK-NEXT: br i1 false, label [[BACKEDGE]], label [[STUCK]]
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;
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entry:
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br label %loop
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backedge: ; preds = %stuck
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br label %loop
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loop: ; preds = %backedge, %entry
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%iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]
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%iv.zext = zext i32 %iv to i64
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%gep = getelementptr inbounds i64, i64* undef, i64 %iv.zext
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%iv.next = add i32 %iv, -1
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%loop.exit.cond = icmp slt i32 %iv.next, 11
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br i1 %loop.exit.cond, label %exit, label %stuck
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exit: ; preds = %loop
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%iv.next.lcssa = phi i32 [ %iv.next, %loop ]
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ret void
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stuck: ; preds = %stuck, %loop
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br i1 false, label %backedge, label %stuck
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}
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