derek.holloway
7502bf64a4
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47 lines
1.5 KiB
LLVM
47 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -passes=indvars -S %s | FileCheck %s
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128-Fn32"
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define void @rewrite_preserve_add_nsw(i32 %a) {
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; CHECK-LABEL: define void @rewrite_preserve_add_nsw(
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; CHECK-SAME: i32 [[A:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[A]], 4
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; CHECK-NEXT: call void @use(i32 noundef [[ADD]])
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; CHECK-NEXT: [[PRE:%.*]] = icmp sgt i32 [[A]], -4
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; CHECK-NEXT: br i1 [[PRE]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
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; CHECK: loop.preheader:
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; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[A]], 5
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ]
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; CHECK-NEXT: call void @clobber()
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; CHECK-NEXT: [[IV_NEXT]] = add nuw i32 [[IV]], 1
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; CHECK-NEXT: [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[TMP0]]
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; CHECK-NEXT: br i1 [[EC]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
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; CHECK: exit.loopexit:
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; CHECK-NEXT: br label [[EXIT]]
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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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%add = add nsw i32 %a, 4
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call void @use(i32 noundef %add)
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%pre = icmp sgt i32 %a, -4
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br i1 %pre, label %loop, label %exit
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loop:
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%iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
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call void @clobber()
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%iv.next = add i32 %iv, 1
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%ec = icmp slt i32 %iv, %add
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br i1 %ec, label %loop, label %exit
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exit:
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ret void
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}
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declare void @clobber()
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declare void @use(i32)
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