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1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py2; RUN: llc < %s | FileCheck %s3 4target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"5target triple = "thumbv6m-arm-none-eabi"6 7; From https://reviews.llvm.org/D622668; This used to cause an endless loop in DAGCombine,9; since we were hoisting two binops with constants, one constant being opaque,10; which is why they weren't getting constant folded.11 12@a = dso_local local_unnamed_addr global i32 0, align 413@b = dso_local local_unnamed_addr global i32 0, align 414 15; Function Attrs: minsize nounwind optsize16define dso_local i32 @c() local_unnamed_addr #0 {17; CHECK-LABEL: c:18; CHECK: @ %bb.0: @ %entry19; CHECK-NEXT: .save {r4, lr}20; CHECK-NEXT: push {r4, lr}21; CHECK-NEXT: ldr r0, .LCPI0_022; CHECK-NEXT: ldr r0, [r0]23; CHECK-NEXT: ldr r4, .LCPI0_124; CHECK-NEXT: subs r0, r4, r025; CHECK-NEXT: adds r0, r0, #126; CHECK-NEXT: bl d27; CHECK-NEXT: ldr r0, .LCPI0_228; CHECK-NEXT: ldr r0, [r0]29; CHECK-NEXT: cmp r0, r430; CHECK-NEXT: ble .LBB0_231; CHECK-NEXT: @ %bb.1: @ %if.then32; CHECK-NEXT: bl e33; CHECK-NEXT: .LBB0_2: @ %if.end34; CHECK-NEXT: pop {r4, pc}35; CHECK-NEXT: .p2align 236; CHECK-NEXT: @ %bb.3:37; CHECK-NEXT: .LCPI0_0:38; CHECK-NEXT: .long a39; CHECK-NEXT: .LCPI0_1:40; CHECK-NEXT: .long 1999 @ 0x7cf41; CHECK-NEXT: .LCPI0_2:42; CHECK-NEXT: .long b43entry:44 %0 = load i32, ptr @a, align 445 %sub = sub nsw i32 2000, %046 %call = tail call i32 @d(i32 %sub) #247 %1 = load i32, ptr @b, align 448 %cmp = icmp sgt i32 %1, 199949 br i1 %cmp, label %if.then, label %if.end50 51if.then: ; preds = %entry52 %call1 = tail call i32 @e() #253 br label %if.end54 55if.end: ; preds = %if.then, %entry56 ret i32 undef57}58 59declare dso_local i32 @d(...) local_unnamed_addr #160declare dso_local i32 @e(...) local_unnamed_addr #161