1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes='default<O2>' -S < %s | FileCheck %s 3 4define void @PR47852(ptr noundef %d, i32 noundef %c) { 5; CHECK-LABEL: @PR47852( 6; CHECK-NEXT: entry: 7; CHECK-NEXT: [[CMP_NOT1:%.*]] = icmp eq i32 [[C:%.*]], 0 8; CHECK-NEXT: br i1 [[CMP_NOT1]], label [[WHILE_END:%.*]], label [[WHILE_BODY_PREHEADER:%.*]] 9; CHECK: while.body.preheader: 10; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[C]] to i64 11; CHECK-NEXT: tail call void @llvm.memset.p0.i64(ptr align 1 [[D:%.*]], i8 0, i64 [[TMP0]], i1 false) 12; CHECK-NEXT: br label [[WHILE_END]] 13; CHECK: while.end: 14; CHECK-NEXT: ret void 15; 16entry: 17 br label %while.cond 18 19while.cond: 20 %c.addr.0 = phi i32 [ %c, %entry ], [ %dec, %while.body ] 21 %d.addr.0 = phi ptr [ %d, %entry ], [ %incdec.ptr, %while.body ] 22 %dec = add i32 %c.addr.0, -1 23 %cmp = icmp ugt i32 %c.addr.0, 0 24 br i1 %cmp, label %while.body, label %while.end 25 26while.body: 27 %incdec.ptr = getelementptr inbounds i8, ptr %d.addr.0, i32 1 28 store i8 0, ptr %d.addr.0, align 1 29 br label %while.cond 30 31while.end: 32 ret void 33} 34