[PATCH] D31077: Improve DAGTypeLegalizer::PromoteIntRes_TRUNCATE() to handle widening.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: test/CodeGen/SystemZ/vec-trunc-to-i1.ll:4
+; Check that a widening truncate to a vector of i1 elements can be handled.
+
+define void @autogen_SD29574(i8*, i32*, i64*, i32, i64, i8) {
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jonpa wrote:
> RKSimon wrote:
> > Reduced with bugpoint:
> > 
> > ```
> > define void @autogen_SD29574() {
> > BB:
> >   %B15 = sub <4 x i8> undef, zeroinitializer
> >   br label %CF34
> > 
> > CF34:                                             ; preds = %CF34, %BB
> >   %Tr24 = trunc <4 x i8> %B15 to <4 x i1>
> >   %Cmp26 = icmp slt <4 x i1> %Tr24, undef
> >   %E28 = extractelement <4 x i1> %Cmp26, i32 3
> >   br i1 %E28, label %CF34, label %CF36
> > 
> > CF36:                                             ; preds = %CF34
> >   ret void
> > }
> > ```
> Oops - thought I had done that... thanks.
You might be able to manually reduce it further. Also, you should probably rename the test pr32275 or something to indicate its origin.


https://reviews.llvm.org/D31077