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[VirtRegMap] Fix for PR17825. Do not ignore noreturn definitions when setting

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isPhysRegUsed if the unwind information is required.
Indeed, the runtime may need a correct stack to be able to unwind the call.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194271 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet
2013-11-08 18:14:17 +00:00
parent 071a4f1a66
commit f0c6ab6f00
2 changed files with 21 additions and 5 deletions
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lib/CodeGen/VirtRegMap.cpp
+5 -1
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@@ -285,7 +285,11 @@ void VirtRegRewriter::rewrite() {
if (!MO.isGlobal())
continue;
const Function *Func = dyn_cast<Function>(MO.getGlobal());
if (!Func || !Func->hasFnAttribute(Attribute::NoReturn))
if (!Func || !Func->hasFnAttribute(Attribute::NoReturn) ||
// We need to keep correct unwind information
// even if the function will not return, since the
// runtime may need it.
!Func->hasFnAttribute(Attribute::NoUnwind))
continue;
NoReturnInsts.insert(MI);
break;