[PS4] Guarantee an instruction after a 'noreturn' call.
We need the "return address" of a noreturn call to be within the
bounds of the calling function; TrapUnreachable turns 'unreachable'
into a 'ud2' instruction, which has that desired effect.
Differential Revision: http://reviews.llvm.org/D18414
llvm-svn: 264224
diff --git a/llvm/lib/Target/X86/X86TargetMachine.cpp b/llvm/lib/Target/X86/X86TargetMachine.cpp
index 806ba12..382de99 100644
--- a/llvm/lib/Target/X86/X86TargetMachine.cpp
+++ b/llvm/lib/Target/X86/X86TargetMachine.cpp
@@ -119,7 +119,9 @@
// after a call to 'noreturn' function.
// To prevent that, we emit a trap for 'unreachable' IR instructions.
// (which on X86, happens to be the 'ud2' instruction)
- if (Subtarget.isTargetWin64())
+ // On PS4, the "return address" of a 'noreturn' call must still be within
+ // the calling function, and TrapUnreachable is an easy way to get that.
+ if (Subtarget.isTargetWin64() || Subtarget.isTargetPS4())
this->Options.TrapUnreachable = true;
// By default (and when -ffast-math is on), enable estimate codegen for