1 ; RUN: llc < %s -O3 -mtriple=arm64-unknown-unknown -mcpu=cyclone -pre-RA-sched=list-hybrid | FileCheck %s 2 ; <rdar://problem/11635990> [arm64] [lsr] Inefficient EA/loop-exit calc in bzero_phys 3 ; 4 ; LSR on loop %while.cond should reassociate non-address mode 5 ; expressions at use %cmp16 to avoid sinking computation into %while.body18. 6 ; 7 ; Remove the -pre-RA-sched=list-hybrid option after fixing: 8 ; <rdar://problem/12702735> [ARM64][coalescer] need better register 9 ; coalescing for simple unit tests. 10 11 ; CHECK: @memset 12 ; CHECK: %while.body18{{$}} 13 ; CHECK: str x{{[0-9]+}}, [x{{[0-9]+}}], #8 14 ; First set the IVREG variable, then use it 15 ; CHECK-NEXT: sub [[IVREG:x[0-9]+]], 16 ; CHECK: [[IVREG]], #8 17 ; CHECK-NEXT: cmp [[IVREG]], #7 18 ; CHECK-NEXT: b.hi 19 define i8* @memset(i8* %dest, i32 %val, i64 %len) nounwind ssp noimplicitfloat { 20 entry: 21 %cmp = icmp eq i64 %len, 0 22 br i1 %cmp, label %done, label %while.cond.preheader 23 24 while.cond.preheader: ; preds = %entry 25 %conv = trunc i32 %val to i8 26 br label %while.cond 27 28 while.cond: ; preds = %while.body, %while.cond.preheader 29 %ptr.0 = phi i8* [ %incdec.ptr, %while.body ], [ %dest, %while.cond.preheader ] 30 %len.addr.0 = phi i64 [ %dec, %while.body ], [ %len, %while.cond.preheader ] 31 %cond = icmp eq i64 %len.addr.0, 0 32 br i1 %cond, label %done, label %land.rhs 33 34 land.rhs: ; preds = %while.cond 35 %0 = ptrtoint i8* %ptr.0 to i64 36 %and = and i64 %0, 7 37 %cmp5 = icmp eq i64 %and, 0 38 br i1 %cmp5, label %if.end9, label %while.body 39 40 while.body: ; preds = %land.rhs 41 %incdec.ptr = getelementptr inbounds i8, i8* %ptr.0, i64 1 42 store i8 %conv, i8* %ptr.0, align 1, !tbaa !0 43 %dec = add i64 %len.addr.0, -1 44 br label %while.cond 45 46 if.end9: ; preds = %land.rhs 47 %conv.mask = and i32 %val, 255 48 %1 = zext i32 %conv.mask to i64 49 %2 = shl nuw nsw i64 %1, 8 50 %ins18 = or i64 %2, %1 51 %3 = shl nuw nsw i64 %1, 16 52 %ins15 = or i64 %ins18, %3 53 %4 = shl nuw nsw i64 %1, 24 54 %5 = shl nuw nsw i64 %1, 32 55 %mask8 = or i64 %ins15, %4 56 %6 = shl nuw nsw i64 %1, 40 57 %mask5 = or i64 %mask8, %5 58 %7 = shl nuw nsw i64 %1, 48 59 %8 = shl nuw i64 %1, 56 60 %mask2.masked = or i64 %mask5, %6 61 %mask = or i64 %mask2.masked, %7 62 %ins = or i64 %mask, %8 63 %9 = bitcast i8* %ptr.0 to i64* 64 %cmp1636 = icmp ugt i64 %len.addr.0, 7 65 br i1 %cmp1636, label %while.body18, label %while.body29.lr.ph 66 67 while.body18: ; preds = %if.end9, %while.body18 68 %wideptr.038 = phi i64* [ %incdec.ptr19, %while.body18 ], [ %9, %if.end9 ] 69 %len.addr.137 = phi i64 [ %sub, %while.body18 ], [ %len.addr.0, %if.end9 ] 70 %incdec.ptr19 = getelementptr inbounds i64, i64* %wideptr.038, i64 1 71 store i64 %ins, i64* %wideptr.038, align 8, !tbaa !2 72 %sub = add i64 %len.addr.137, -8 73 %cmp16 = icmp ugt i64 %sub, 7 74 br i1 %cmp16, label %while.body18, label %while.end20 75 76 while.end20: ; preds = %while.body18 77 %cmp21 = icmp eq i64 %sub, 0 78 br i1 %cmp21, label %done, label %while.body29.lr.ph 79 80 while.body29.lr.ph: ; preds = %while.end20, %if.end9 81 %len.addr.1.lcssa49 = phi i64 [ %sub, %while.end20 ], [ %len.addr.0, %if.end9 ] 82 %wideptr.0.lcssa48 = phi i64* [ %incdec.ptr19, %while.end20 ], [ %9, %if.end9 ] 83 %10 = bitcast i64* %wideptr.0.lcssa48 to i8* 84 br label %while.body29 85 86 while.body29: ; preds = %while.body29, %while.body29.lr.ph 87 %len.addr.235 = phi i64 [ %len.addr.1.lcssa49, %while.body29.lr.ph ], [ %dec26, %while.body29 ] 88 %ptr.134 = phi i8* [ %10, %while.body29.lr.ph ], [ %incdec.ptr31, %while.body29 ] 89 %dec26 = add i64 %len.addr.235, -1 90 %incdec.ptr31 = getelementptr inbounds i8, i8* %ptr.134, i64 1 91 store i8 %conv, i8* %ptr.134, align 1, !tbaa !0 92 %cmp27 = icmp eq i64 %dec26, 0 93 br i1 %cmp27, label %done, label %while.body29 94 95 done: ; preds = %while.cond, %while.body29, %while.end20, %entry 96 ret i8* %dest 97 } 98 99 !0 = !{!"omnipotent char", !1} 100 !1 = !{!"Simple C/C++ TBAA"} 101 !2 = !{!"long long", !0} 102
