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1; RUN: opt -verify-loop-info -irce-print-changed-loops -passes=irce -S < %s 2>&1 | FileCheck %s2; RUN: opt -verify-loop-info -irce-print-changed-loops -passes='require<branch-prob>,irce' -S < %s 2>&1 | FileCheck %s3 4; The test demonstrates that incorrect behavior of Clamp may lead to incorrect5; calculation of post-loop exit condition.6 7; CHECK-LABEL: irce: in function test_01: constrained Loop at depth 1 containing: %loop<header><exiting>,%in_bounds<exiting>,%not_zero<latch><exiting>8; CHECK-NOT: irce: in function test_02: constrained Loop9 10define void @test_01() {11 12; CHECK-LABEL: test_0113 14entry:15 %indvars.iv.next467 = add nuw nsw i64 2, 116 %length.i167 = load i32, ptr addrspace(1) undef, align 817 %tmp21 = zext i32 %length.i167 to i6418 %tmp34 = load atomic i32, ptr addrspace(1) undef unordered, align 419 %tmp35 = add i32 %tmp34, -958120 %tmp36 = icmp ugt i32 %length.i167, 121 br i1 %tmp36, label %preheader, label %exit22 23exit: ; preds = %in_bounds, %loop, %not_zero, %entry24 ret void25 26preheader: ; preds = %entry27; CHECK: preheader:28; CHECK-NEXT: %length_gep.i146 = getelementptr inbounds i8, ptr addrspace(1) undef, i64 829; CHECK-NEXT: %tmp43 = icmp ult i64 %indvars.iv.next467, %tmp2130; CHECK-NEXT: %exit.mainloop.at = call i64 @llvm.umax.i64(i64 %tmp21, i64 1)31; CHECK-NEXT: [[C1:%[^ ]+]] = icmp ult i64 1, %exit.mainloop.at32; CHECK-NEXT: br i1 [[C1]], label %loop.preheader, label %main.pseudo.exit33 34 %length_gep.i146 = getelementptr inbounds i8, ptr addrspace(1) undef, i64 835 %tmp43 = icmp ult i64 %indvars.iv.next467, %tmp2136 br label %loop37 38not_zero: ; preds = %in_bounds39; CHECK: not_zero:40; CHECK: %tmp56 = icmp ult i64 %indvars.iv.next, %tmp2141; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i64 %indvars.iv.next, %exit.mainloop.at42; CHECK-NEXT: br i1 [[COND]], label %loop, label %main.exit.selector43 44 %tmp51 = trunc i64 %indvars.iv.next to i3245 %tmp53 = mul i32 %tmp51, %tmp5146 %tmp54 = add i32 %tmp53, -958247 %tmp55 = add i32 %tmp54, %tmp6248 %tmp56 = icmp ult i64 %indvars.iv.next, %tmp2149 br i1 %tmp56, label %loop, label %exit50 51loop: ; preds = %not_zero, %preheader52 %tmp62 = phi i32 [ 1, %preheader ], [ %tmp55, %not_zero ]53 %indvars.iv750 = phi i64 [ 1, %preheader ], [ %indvars.iv.next, %not_zero ]54 %length.i148 = load i32, ptr addrspace(1) undef, align 855 %tmp68 = zext i32 %length.i148 to i6456 %tmp97 = icmp ult i64 2, %tmp6857 %or.cond = and i1 %tmp43, %tmp9758 %tmp99 = icmp ult i64 %indvars.iv750, %tmp2159 %or.cond1 = and i1 %or.cond, %tmp9960 br i1 %or.cond1, label %in_bounds, label %exit61 62in_bounds: ; preds = %loop63 %indvars.iv.next = add nuw nsw i64 %indvars.iv750, 364 %tmp107 = icmp ult i64 %indvars.iv.next, 265 br i1 %tmp107, label %not_zero, label %exit66}67 68define void @test_02() {69 70; Now IRCE is smart enough to understand that the safe range here is empty.71; Previously it executed the entire loop in safe preloop and never actually72; entered the main loop.73 74entry:75 br label %loop76 77loop: ; preds = %in_bounds, %entry78 %iv1 = phi i64 [ 3, %entry ], [ %iv1.next, %in_bounds ]79 %iv2 = phi i64 [ 4294967295, %entry ], [ %iv2.next, %in_bounds ]80 %iv2.offset = add i64 %iv2, 181 %rc = icmp ult i64 %iv2.offset, 40082 br i1 %rc, label %in_bounds, label %bci_32183 84bci_321: ; preds = %in_bounds, %loop85 ret void86 87in_bounds: ; preds = %loop88 %iv1.next = add nuw nsw i64 %iv1, 289 %iv2.next = add nuw nsw i64 %iv2, 290 %cond = icmp ugt i64 %iv1, 20491 br i1 %cond, label %bci_321, label %loop92}93