Stop resetting NoFramePointerElim in TargetMachine::resetTargetOptions.
This is part of the work to remove TargetMachine::resetTargetOptions.
In this patch, instead of updating global variable NoFramePointerElim in
resetTargetOptions, its use in DisableFramePointerElim is replaced with a call
to TargetFrameLowering::noFramePointerElim. This function determines on a
per-function basis if frame pointer elimination should be disabled.
There is no change in functionality except that cl:opt option "disable-fp-elim"
can now override function attribute "no-frame-pointer-elim".
llvm-svn: 238080
diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index 4eafd82..a52e497 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -43,6 +43,14 @@
: TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
STI(sti) {}
+bool ARMFrameLowering::noFramePointerElim(const MachineFunction &MF) const {
+ // iOS always has a FP for backtracking, force other targets to keep their FP
+ // when doing FastISel. The emitted code is currently superior, and in cases
+ // like test-suite's lencod FastISel isn't quite correct when FP is eliminated.
+ return TargetFrameLowering::noFramePointerElim(MF) ||
+ MF.getSubtarget<ARMSubtarget>().useFastISel();
+}
+
/// hasFP - Return true if the specified function should have a dedicated frame
/// pointer register. This is true if the function has variable sized allocas
/// or if frame pointer elimination is disabled.