1*9880d681SAndroid Build Coastguard Worker; RUN: llc -march=mips -mcpu=mips32r6 -O1 -start-after=dwarfehprepare < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; beqc/bnec have the constraint that $rs < $rt && $rs != 0 && $rt != 0 4*9880d681SAndroid Build Coastguard Worker; Cases where $rs == 0 and $rt != 0 should be transformed into beqzc/bnezc. 5*9880d681SAndroid Build Coastguard Worker; Cases where $rs > $rt can have the operands swapped as ==,!= are commutative. 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Worker; Cases where beq & bne where $rs == $rt have to inhibited from being turned 8*9880d681SAndroid Build Coastguard Worker; into compact branches but arguably should not occur. This test covers the 9*9880d681SAndroid Build Coastguard Worker; $rs == $rt case. 10*9880d681SAndroid Build Coastguard Worker 11*9880d681SAndroid Build Coastguard Worker; Starting from dwarf exception handling preparation skips optimizations that 12*9880d681SAndroid Build Coastguard Worker; may simplify out the crucical bnec $4, $4 instruction. 13*9880d681SAndroid Build Coastguard Worker 14*9880d681SAndroid Build Coastguard Workerdefine internal void @_ZL14TestRemoveLastv(i32* %alist.sroa.0.4) { 15*9880d681SAndroid Build Coastguard Workerentry: 16*9880d681SAndroid Build Coastguard Worker %ascevgep = getelementptr i32, i32* %alist.sroa.0.4, i64 99 17*9880d681SAndroid Build Coastguard Worker br label %do.body121 18*9880d681SAndroid Build Coastguard Worker 19*9880d681SAndroid Build Coastguard Workerfor.cond117: 20*9880d681SAndroid Build Coastguard Worker %alsr.iv.next = add nsw i32 %alsr.iv, -1 21*9880d681SAndroid Build Coastguard Worker %ascevgep340 = getelementptr i32, i32* %alsr.iv339, i64 -1 22*9880d681SAndroid Build Coastguard Worker %acmp118 = icmp sgt i32 %alsr.iv.next, 0 23*9880d681SAndroid Build Coastguard Worker br i1 %acmp118, label %do.body121, label %if.then143 24*9880d681SAndroid Build Coastguard Worker 25*9880d681SAndroid Build Coastguard Workerdo.body121: 26*9880d681SAndroid Build Coastguard Worker %alsr.iv339 = phi i32* [ %ascevgep, %entry ], [ %ascevgep340, %for.cond117 ] 27*9880d681SAndroid Build Coastguard Worker %alsr.iv = phi i32 [ 100, %entry ], [ %alsr.iv.next, %for.cond117 ] 28*9880d681SAndroid Build Coastguard Worker %a9 = add i32 %alsr.iv, -1 29*9880d681SAndroid Build Coastguard Worker %alnot124 = icmp eq i32 %alsr.iv, %alsr.iv 30*9880d681SAndroid Build Coastguard Worker br i1 %alnot124, label %do.body134, label %if.then143, !prof !11 31*9880d681SAndroid Build Coastguard Worker 32*9880d681SAndroid Build Coastguard Workerdo.body134: 33*9880d681SAndroid Build Coastguard Worker %a10 = add i32 %alsr.iv, -1 34*9880d681SAndroid Build Coastguard Worker %a11 = load i32, i32* %alsr.iv339, align 4, !tbaa !5 35*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: bnec $[[R0:[0-9]+]], $[[R0]] 36*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: beqc $[[R1:[0-9]+]], $[[R1]] 37*9880d681SAndroid Build Coastguard Worker %alnot137 = icmp eq i32 %a9, %a11 38*9880d681SAndroid Build Coastguard Worker br i1 %alnot137, label %do.end146, label %if.then143, !prof !11 39*9880d681SAndroid Build Coastguard Worker 40*9880d681SAndroid Build Coastguard Workerif.then143: 41*9880d681SAndroid Build Coastguard Worker ret void 42*9880d681SAndroid Build Coastguard Worker unreachable 43*9880d681SAndroid Build Coastguard Worker 44*9880d681SAndroid Build Coastguard Workerdo.end146: 45*9880d681SAndroid Build Coastguard Worker %alnot151 = icmp eq i32 %a9, %a10 46*9880d681SAndroid Build Coastguard Worker br i1 %alnot151, label %for.cond117, label %if.then143, !prof !11 47*9880d681SAndroid Build Coastguard Worker 48*9880d681SAndroid Build Coastguard Worker} 49*9880d681SAndroid Build Coastguard Worker!3 = !{!"omnipotent char", !4, i64 0} 50*9880d681SAndroid Build Coastguard Worker!4 = !{!"Simple C++ TBAA"} 51*9880d681SAndroid Build Coastguard Worker!5 = !{!6, !6, i64 0} 52*9880d681SAndroid Build Coastguard Worker!6 = !{!"int", !3, i64 0} 53*9880d681SAndroid Build Coastguard Worker!11 = !{!"branch_weights", i32 2000, i32 1} 54*9880d681SAndroid Build Coastguard Worker!12 = !{!"branch_weights", i32 -388717296, i32 7818360} 55*9880d681SAndroid Build Coastguard Worker 56