Hackfix for combine generating unsupported types.

jacobly0 · jacobly0 · commit ba05d30dd5c0 · 2022-01-30T08:47:21.000-05:00
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -245,7 +245,7 @@ bool InstCombinerImpl::shouldChangeType(unsigned FromWidth,
   if (!FromLegal && !ToLegal && ToWidth > FromWidth)
     return false;
 
-  return true;
+  return ToLegal; // FIXME jacobly: change to true when backend supports illegal types
 }
 
 /// Return true if it is desirable to convert a computation from 'From' to 'To'.

Original file line number	Diff line number	Diff line change
`@@ -245,7 +245,7 @@ bool InstCombinerImpl::shouldChangeType(unsigned FromWidth,`
`245`	`245`	`if (!FromLegal && !ToLegal && ToWidth > FromWidth)`
`246`	`246`	`return false;`
`247`	`247`
`248`		`- return true;`
	`248`	`+ return ToLegal; // FIXME jacobly: change to true when backend supports illegal types`
`249`	`249`	`}`
`250`	`250`
`251`	`251`	`/// Return true if it is desirable to convert a computation from 'From' to 'To'.`