remat-fold-load.ll [plain text]
; RUN: llc < %s -disable-fp-elim -verify-coalescing
; PR13414
;
; During coalescing, remat triggers DCE which deletes the penultimate use of a
; load. This load should not be folded into the remaining use because it is not
; safe to move, and it would extend the live range of the address.
;
; LiveRangeEdit::foldAsLoad() doesn't extend live ranges, so -verify-coalescing
; catches the problem.
target triple = "i386-unknown-linux-gnu"
%type_a = type { %type_a*, %type_b }
%type_b = type { %type_c, i32 }
%type_c = type { i32, %type_d }
%type_d = type { i64 }
%type_e = type { %type_c, i64 }
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
define linkonce_odr void @test() nounwind {
entry:
br i1 undef, label %while.end.while.end26_crit_edge, label %while.body12.lr.ph
while.end.while.end26_crit_edge: ; preds = %entry
br label %while.end26
while.body12.lr.ph: ; preds = %entry
br label %while.body12
while.body12: ; preds = %if.end24, %while.body12.lr.ph
%tmp = phi %type_a* [ undef, %while.body12.lr.ph ], [ %tmp18, %if.end24 ]
%ins151154161 = phi i128 [ 0, %while.body12.lr.ph ], [ %phitmp, %if.end24 ]
%ins135156160 = phi i128 [ 0, %while.body12.lr.ph ], [ %phitmp158, %if.end24 ]
%ins151 = or i128 0, %ins151154161
%cmp.i.i.i.i.i67 = icmp sgt i32 undef, 8
br i1 %cmp.i.i.i.i.i67, label %if.then.i.i.i.i71, label %if.else.i.i.i.i74
if.then.i.i.i.i71: ; preds = %while.body12
%call4.i.i.i.i68 = call noalias i8* @malloc(i32 undef) nounwind
%tmp1 = getelementptr inbounds %type_a* %tmp, i32 0, i32 1, i32 0, i32 1
%buf_6.i.i.i.i70 = bitcast %type_d* %tmp1 to i8**
%tmp2 = load i8** %buf_6.i.i.i.i70, align 4
call void @llvm.memcpy.p0i8.p0i8.i32(i8* undef, i8* %tmp2, i32 undef, i32 1, i1 false) nounwind
unreachable
if.else.i.i.i.i74: ; preds = %while.body12
%i_.i.i.i.i72 = getelementptr inbounds %type_a* %tmp, i32 0, i32 1, i32 0, i32 1, i32 0
%tmp3 = load i64* %i_.i.i.i.i72, align 4
%tmp4 = zext i64 %tmp3 to i128
%tmp5 = shl nuw nsw i128 %tmp4, 32
%ins148 = or i128 %tmp5, %ins151
%second3.i.i76 = getelementptr inbounds %type_a* %tmp, i32 0, i32 1, i32 1
%tmp6 = load i32* %second3.i.i76, align 4
%tmp7 = zext i32 %tmp6 to i128
%tmp8 = shl nuw i128 %tmp7, 96
%mask144 = and i128 %ins148, 79228162495817593519834398720
%tmp9 = load %type_e** undef, align 4
%len_.i.i.i.i86 = getelementptr inbounds %type_e* %tmp9, i32 0, i32 0, i32 0
%tmp10 = load i32* %len_.i.i.i.i86, align 4
%tmp11 = zext i32 %tmp10 to i128
%ins135 = or i128 %tmp11, %ins135156160
%cmp.i.i.i.i.i88 = icmp sgt i32 %tmp10, 8
br i1 %cmp.i.i.i.i.i88, label %if.then.i.i.i.i92, label %if.else.i.i.i.i95
if.then.i.i.i.i92: ; preds = %if.else.i.i.i.i74
%call4.i.i.i.i89 = call noalias i8* @malloc(i32 %tmp10) nounwind
%ins126 = or i128 0, %ins135
%tmp12 = getelementptr inbounds %type_e* %tmp9, i32 0, i32 0, i32 1
%buf_6.i.i.i.i91 = bitcast %type_d* %tmp12 to i8**
%tmp13 = load i8** %buf_6.i.i.i.i91, align 4
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %call4.i.i.i.i89, i8* %tmp13, i32 %tmp10, i32 1, i1 false) nounwind
br label %A
if.else.i.i.i.i95: ; preds = %if.else.i.i.i.i74
%i_.i.i.i.i93 = getelementptr inbounds %type_e* %tmp9, i32 0, i32 0, i32 1, i32 0
br label %A
A: ; preds = %if.else.i.i.i.i95, %if.then.i.i.i.i92
%ins135157 = phi i128 [ %ins126, %if.then.i.i.i.i92 ], [ undef, %if.else.i.i.i.i95 ]
%second3.i.i97 = getelementptr inbounds %type_e* %tmp9, i32 0, i32 1
%tmp14 = load i64* %second3.i.i97, align 4
%tmp15 = trunc i64 %tmp14 to i32
%cmp.i99 = icmp sgt i32 %tmp6, %tmp15
%tmp16 = trunc i128 %ins135157 to i32
%cmp.i.i.i.i.i.i101 = icmp sgt i32 %tmp16, 8
br i1 %cmp.i.i.i.i.i.i101, label %if.then.i.i.i.i.i103, label %B
if.then.i.i.i.i.i103: ; preds = %A
unreachable
B: ; preds = %A
%tmp17 = trunc i128 %ins148 to i32
%cmp.i.i.i.i.i.i83 = icmp sgt i32 %tmp17, 8
br i1 %cmp.i.i.i.i.i.i83, label %if.then.i.i.i.i.i85, label %C
if.then.i.i.i.i.i85: ; preds = %B
unreachable
C: ; preds = %B
br i1 %cmp.i99, label %if.then17, label %if.end24
if.then17: ; preds = %C
br i1 false, label %if.then.i.i.i.i.i43, label %D
if.then.i.i.i.i.i43: ; preds = %if.then17
unreachable
D: ; preds = %if.then17
br i1 undef, label %if.then.i.i.i.i.i, label %E
if.then.i.i.i.i.i: ; preds = %D
unreachable
E: ; preds = %D
br label %if.end24
if.end24: ; preds = %E, %C
%phitmp = or i128 %tmp8, %mask144
%phitmp158 = or i128 undef, undef
%tmp18 = load %type_a** undef, align 4
%tmp19 = load %type_a** undef, align 4
%cmp.i49 = icmp eq %type_a* %tmp18, %tmp19
br i1 %cmp.i49, label %while.cond10.while.end26_crit_edge, label %while.body12
while.cond10.while.end26_crit_edge: ; preds = %if.end24
%.pre = load %type_e** undef, align 4
br label %while.end26
while.end26: ; preds = %while.cond10.while.end26_crit_edge, %while.end.while.end26_crit_edge
br i1 undef, label %while.body.lr.ph.i, label %F
while.body.lr.ph.i: ; preds = %while.end26
br label %while.body.i
while.body.i: ; preds = %while.body.i, %while.body.lr.ph.i
br i1 false, label %while.body.i, label %F
F: ; preds = %while.body.i, %while.end26
ret void
}
declare noalias i8* @malloc(i32) nounwind