averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-21 12:14:44 +01:00
Code Issues Packages Projects Releases Wiki Activity

[inst-simplify] Eliminate identity unchecked_addr_cast, unchecked_ref_cast.

Browse Source 
Swift SVN r17523
This commit is contained in:
Michael Gottesman
2014-05-06 02:06:55 +00:00
parent 4d751328bf
commit 083ac18f21
3 changed files with 39 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
lib/SILPasses/SILCombine.cpp
View File

@@ -1082,7 +1082,8 @@ SILCombiner::visitUncheckedAddrCastInst(UncheckedAddrCastInst *UADCI) {
UADCI->getLoc(), OtherUADCI->getOperand(), UADCI->getType());
// (unchecked-addr-cast cls->superclass) -> (upcast cls->superclass)
if (UADCI->getType().isSuperclassOf(UADCI->getOperand().getType()))
if (UADCI->getType() != UADCI->getOperand().getType() &&
UADCI->getType().isSuperclassOf(UADCI->getOperand().getType()))
return new (UADCI->getModule())
UpcastInst(UADCI->getLoc(), UADCI->getOperand(), UADCI->getType());
@@ -1103,9 +1104,11 @@ SILCombiner::visitUncheckedRefCastInst(UncheckedRefCastInst *URCI) {
return new (URCI->getModule())
UncheckedRefCastInst(URCI->getLoc(), UI->getOperand(), URCI->getType());
if (URCI->getType().isSuperclassOf(URCI->getOperand().getType()))
if (URCI->getType() != URCI->getOperand().getType() &&
URCI->getType().isSuperclassOf(URCI->getOperand().getType()))
return new (URCI->getModule())
UpcastInst(URCI->getLoc(), URCI->getOperand(), URCI->getType());
return nullptr;
}