When moving zext/sext to be folded with a load, ignore the issue of whether

truncates are free only in the case where the extended type is legal but the
load type is not.  If both types are illegal, such as when they are too big,
the load may not be legalized into an extended load.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114568 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 526107c..3221e14 100644 (file)
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -772,7 +772,8 @@ bool CodeGenPrepare::MoveExtToFormExtLoad(Instruction *I) {
   // If the load has other users and the truncate is not free, this probably
   // isn't worthwhile.
   if (!LI->hasOneUse() &&
-      TLI && TLI->isTypeLegal(TLI->getValueType(LI->getType())) &&
+      TLI && (TLI->isTypeLegal(TLI->getValueType(LI->getType())) ||
+              !TLI->isTypeLegal(TLI->getValueType(I->getType()))) &&
       !TLI->isTruncateFree(I->getType(), LI->getType()))
     return false;