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7dbcddeeab
Before I started maintaining the AVR backend, this instruction never originally used to have an earlyclobber flag. Some time afterwards (years ago), I must've added it back in, not realising that it was left out for a reason. This pseudo instrction exists solely to work around a long standing bug in the register allocator. Before this commit, the LDDWRdYQ pseudo was not actually working around any bug. With the earlyclobber flag removed again, the LDDWRdYQ pseudo now correctly works around PR13375 again. llvm-svn: 326774
140 lines
5.3 KiB
LLVM
140 lines
5.3 KiB
LLVM
; RUN: llc < %s -march=avr -mcpu=atmega328 | FileCheck %s
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; This test case is designed to trigger a bug caused by the register
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; allocator not handling the case where a target generates a load/store with
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; a frame index that happens to be an earlyclobber instruction.
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;
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; It is taken from the translated LLVM IR of the Rust core library.
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;
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; The error message looked like
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; Assertion failed: (MI && "No instruction defining live value"), function computeDeadValues
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;
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; See PR13375 for details.
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%values = type { i16, [2 x i8], [40 x i32], [0 x i8] }
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@POW10TO128 = external constant [14 x i32], align 4
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; CHECK: core_num_flt2dec_strategy_dragon
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define nonnull dereferenceable(164) %values* @core_num_flt2dec_strategy_dragon(%values* returned dereferenceable(164) %arg, i16 %arg1) unnamed_addr {
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start:
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%ret.i = alloca [40 x i32], align 4
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%tmp = icmp eq i16 undef, 0
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br i1 %tmp, label %bb5, label %bb1
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bb1:
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unreachable
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bb5:
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br i1 undef, label %bb14, label %bb11
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bb11:
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unreachable
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bb14:
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%tmp2 = bitcast [40 x i32]* %ret.i to i8*
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call void @llvm.memset.p0i8.i16(i8* align 4 %tmp2, i8 0, i16 160, i1 false)
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%tmp3 = getelementptr inbounds %values, %values* %arg, i16 0, i32 0
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%tmp4 = load i16, i16* %tmp3, align 2
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%tmp5 = icmp ult i16 %tmp4, 14
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%tmp6 = getelementptr inbounds %values, %values* %arg, i16 0, i32 2, i16 0
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br i1 %tmp5, label %bb2.i38, label %bb3.i39
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bb2.i38:
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%tmp7 = getelementptr inbounds %values, %values* %arg, i16 0, i32 2, i16 %tmp4
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%tmp8 = ptrtoint i32* %tmp6 to i16
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br label %bb4.outer.i122
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bb4.outer.i122:
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%iter.sroa.0.0.ph.i119 = phi i16 [ %tmp12, %bb24.i141 ], [ %tmp8, %bb2.i38 ]
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%retsz.0.ph.i121 = phi i16 [ %.retsz.0.i140, %bb24.i141 ], [ 0, %bb2.i38 ]
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br label %bb4.i125
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bb4.i125:
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%iter.sroa.0.0.i123 = phi i16 [ %tmp12, %core.iter.Enumerate.ALPHA ], [ %iter.sroa.0.0.ph.i119, %bb4.outer.i122 ]
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%tmp9 = inttoptr i16 %iter.sroa.0.0.i123 to i32*
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%tmp10 = icmp eq i32* %tmp9, %tmp7
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br i1 %tmp10, label %core.num.bignum.Big32x40.exit44, label %core.iter.Enumerate.ALPHA
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core.iter.Enumerate.ALPHA:
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%tmp11 = getelementptr inbounds i32, i32* %tmp9, i16 1
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%tmp12 = ptrtoint i32* %tmp11 to i16
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%tmp13 = load i32, i32* %tmp9, align 4
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%tmp14 = icmp eq i32 %tmp13, 0
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br i1 %tmp14, label %bb4.i125, label %core..iter..Enumerate.exit17
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core..iter..Enumerate.exit17:
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%tmp15 = zext i32 %tmp13 to i64
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br label %core..iter..Enumerate.exit17.i132
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core..iter..Enumerate.exit17.i132:
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%carry.085.i129 = phi i32 [ 0, %core..iter..Enumerate.exit17 ], [ %tmp28, %core_slice_IndexMut.exit13 ]
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%tmp16 = icmp ult i16 undef, 40
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br i1 %tmp16, label %core_slice_IndexMut.exit13, label %panic.i.i14.i134
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bb16.i133:
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%tmp17 = icmp eq i32 %tmp28, 0
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br i1 %tmp17, label %bb24.i141, label %bb21.i136
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panic.i.i14.i134:
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unreachable
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core_slice_IndexMut.exit13:
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%tmp18 = load i32, i32* null, align 4
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%tmp19 = getelementptr inbounds [40 x i32], [40 x i32]* %ret.i, i16 0, i16 undef
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%tmp20 = load i32, i32* %tmp19, align 4
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%tmp21 = zext i32 %tmp18 to i64
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%tmp22 = mul nuw i64 %tmp21, %tmp15
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%tmp23 = zext i32 %tmp20 to i64
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%tmp24 = zext i32 %carry.085.i129 to i64
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%tmp25 = add nuw nsw i64 %tmp23, %tmp24
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%tmp26 = add i64 %tmp25, %tmp22
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%tmp27 = lshr i64 %tmp26, 32
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%tmp28 = trunc i64 %tmp27 to i32
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%tmp29 = icmp eq i32* undef, getelementptr inbounds ([14 x i32], [14 x i32]* @POW10TO128, i16 1, i16 0)
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br i1 %tmp29, label %bb16.i133, label %core..iter..Enumerate.exit17.i132
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bb21.i136:
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%tmp30 = icmp ult i16 undef, 40
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br i1 %tmp30, label %"_ZN4core5slice70_$LT$impl$u20$core..ops..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17h8eccc0af1ec6f971E.exit.i138", label %panic.i.i.i137
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panic.i.i.i137:
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unreachable
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"_ZN4core5slice70_$LT$impl$u20$core..ops..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17h8eccc0af1ec6f971E.exit.i138":
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store i32 %tmp28, i32* undef, align 4
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br label %bb24.i141
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bb24.i141:
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%sz.0.i139 = phi i16 [ 15, %"_ZN4core5slice70_$LT$impl$u20$core..ops..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17h8eccc0af1ec6f971E.exit.i138" ], [ 14, %bb16.i133 ]
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%tmp31 = add i16 %sz.0.i139, 0
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%tmp32 = icmp ult i16 %retsz.0.ph.i121, %tmp31
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%.retsz.0.i140 = select i1 %tmp32, i16 %tmp31, i16 %retsz.0.ph.i121
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br label %bb4.outer.i122
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bb3.i39:
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%tmp33 = call fastcc i16 @_ZN4core3num6bignum8Big32x4010mul_digits9mul_inner17h5d3461bce04d16ccE([40 x i32]* nonnull dereferenceable(160) %ret.i, i32* noalias nonnull readonly getelementptr inbounds ([14 x i32], [14 x i32]* @POW10TO128, i16 0, i16 0), i16 14, i32* noalias nonnull readonly %tmp6, i16 %tmp4)
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br label %core.num.bignum.Big32x40.exit44
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core.num.bignum.Big32x40.exit44:
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%retsz.0.i40 = phi i16 [ %tmp33, %bb3.i39 ], [ %retsz.0.ph.i121, %bb4.i125 ]
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call void @llvm.memcpy.p0i8.p0i8.i16(i8* align 4 undef, i8* align 4 %tmp2, i16 160, i1 false)
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store i16 %retsz.0.i40, i16* %tmp3, align 2
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%tmp34 = and i16 %arg1, 256
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%tmp35 = icmp eq i16 %tmp34, 0
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br i1 %tmp35, label %bb30, label %bb27
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bb27:
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unreachable
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bb30:
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ret %values* %arg
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}
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declare fastcc i16 @_ZN4core3num6bignum8Big32x4010mul_digits9mul_inner17h5d3461bce04d16ccE([40 x i32]* nocapture dereferenceable(160), i32* noalias nonnull readonly, i16, i32* noalias nonnull readonly, i16)
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declare void @llvm.memset.p0i8.i16(i8* nocapture writeonly, i8, i16, i1)
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declare void @llvm.memcpy.p0i8.p0i8.i16(i8* nocapture writeonly, i8* nocapture readonly, i16, i1)
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