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102 lines
4.1 KiB
LLVM
102 lines
4.1 KiB
LLVM
; RUN: llc < %s -O3 -mtriple=arm64-unknown-unknown -mcpu=cyclone -pre-RA-sched=list-hybrid | FileCheck %s
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; <rdar://problem/11635990> [arm64] [lsr] Inefficient EA/loop-exit calc in bzero_phys
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;
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; LSR on loop %while.cond should reassociate non-address mode
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; expressions at use %cmp16 to avoid sinking computation into %while.body18.
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;
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; Remove the -pre-RA-sched=list-hybrid option after fixing:
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; <rdar://problem/12702735> [ARM64][coalescer] need better register
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; coalescing for simple unit tests.
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; CHECK: @memset
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; CHECK: %while.body18{{$}}
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; CHECK: str x{{[0-9]+}}, [x{{[0-9]+}}], #8
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; First set the IVREG variable, then use it
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; CHECK-NEXT: sub [[IVREG:x[0-9]+]],
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; CHECK: [[IVREG]], #8
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; CHECK-NEXT: cmp [[IVREG]], #7
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; CHECK-NEXT: b.hi
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define i8* @memset(i8* %dest, i32 %val, i64 %len) nounwind ssp noimplicitfloat {
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entry:
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%cmp = icmp eq i64 %len, 0
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br i1 %cmp, label %done, label %while.cond.preheader
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while.cond.preheader: ; preds = %entry
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%conv = trunc i32 %val to i8
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br label %while.cond
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while.cond: ; preds = %while.body, %while.cond.preheader
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%ptr.0 = phi i8* [ %incdec.ptr, %while.body ], [ %dest, %while.cond.preheader ]
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%len.addr.0 = phi i64 [ %dec, %while.body ], [ %len, %while.cond.preheader ]
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%cond = icmp eq i64 %len.addr.0, 0
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br i1 %cond, label %done, label %land.rhs
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land.rhs: ; preds = %while.cond
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%0 = ptrtoint i8* %ptr.0 to i64
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%and = and i64 %0, 7
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%cmp5 = icmp eq i64 %and, 0
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br i1 %cmp5, label %if.end9, label %while.body
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while.body: ; preds = %land.rhs
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%incdec.ptr = getelementptr inbounds i8, i8* %ptr.0, i64 1
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store i8 %conv, i8* %ptr.0, align 1, !tbaa !0
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%dec = add i64 %len.addr.0, -1
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br label %while.cond
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if.end9: ; preds = %land.rhs
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%conv.mask = and i32 %val, 255
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%1 = zext i32 %conv.mask to i64
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%2 = shl nuw nsw i64 %1, 8
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%ins18 = or i64 %2, %1
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%3 = shl nuw nsw i64 %1, 16
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%ins15 = or i64 %ins18, %3
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%4 = shl nuw nsw i64 %1, 24
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%5 = shl nuw nsw i64 %1, 32
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%mask8 = or i64 %ins15, %4
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%6 = shl nuw nsw i64 %1, 40
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%mask5 = or i64 %mask8, %5
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%7 = shl nuw nsw i64 %1, 48
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%8 = shl nuw i64 %1, 56
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%mask2.masked = or i64 %mask5, %6
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%mask = or i64 %mask2.masked, %7
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%ins = or i64 %mask, %8
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%9 = bitcast i8* %ptr.0 to i64*
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%cmp1636 = icmp ugt i64 %len.addr.0, 7
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br i1 %cmp1636, label %while.body18, label %while.body29.lr.ph
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while.body18: ; preds = %if.end9, %while.body18
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%wideptr.038 = phi i64* [ %incdec.ptr19, %while.body18 ], [ %9, %if.end9 ]
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%len.addr.137 = phi i64 [ %sub, %while.body18 ], [ %len.addr.0, %if.end9 ]
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%incdec.ptr19 = getelementptr inbounds i64, i64* %wideptr.038, i64 1
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store i64 %ins, i64* %wideptr.038, align 8, !tbaa !2
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%sub = add i64 %len.addr.137, -8
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%cmp16 = icmp ugt i64 %sub, 7
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br i1 %cmp16, label %while.body18, label %while.end20
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while.end20: ; preds = %while.body18
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%cmp21 = icmp eq i64 %sub, 0
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br i1 %cmp21, label %done, label %while.body29.lr.ph
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while.body29.lr.ph: ; preds = %while.end20, %if.end9
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%len.addr.1.lcssa49 = phi i64 [ %sub, %while.end20 ], [ %len.addr.0, %if.end9 ]
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%wideptr.0.lcssa48 = phi i64* [ %incdec.ptr19, %while.end20 ], [ %9, %if.end9 ]
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%10 = bitcast i64* %wideptr.0.lcssa48 to i8*
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br label %while.body29
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while.body29: ; preds = %while.body29, %while.body29.lr.ph
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%len.addr.235 = phi i64 [ %len.addr.1.lcssa49, %while.body29.lr.ph ], [ %dec26, %while.body29 ]
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%ptr.134 = phi i8* [ %10, %while.body29.lr.ph ], [ %incdec.ptr31, %while.body29 ]
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%dec26 = add i64 %len.addr.235, -1
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%incdec.ptr31 = getelementptr inbounds i8, i8* %ptr.134, i64 1
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store i8 %conv, i8* %ptr.134, align 1, !tbaa !0
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%cmp27 = icmp eq i64 %dec26, 0
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br i1 %cmp27, label %done, label %while.body29
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done: ; preds = %while.cond, %while.body29, %while.end20, %entry
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ret i8* %dest
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}
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!0 = !{!"omnipotent char", !1}
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!1 = !{!"Simple C/C++ TBAA"}
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!2 = !{!"long long", !0}
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