From 478a8a02bc0f2e739ed8f4240152e99837e480b9 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Thu, 2 Feb 2012 23:52:57 +0000 Subject: Require non-NULL register masks. It doesn't seem worthwhile to give meaning to a NULL register mask pointer. It complicates all the code using register mask operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149646 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/Target/TargetRegisterInfo.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'include/llvm/Target') diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h index 36ac5df..711129f 100644 --- a/include/llvm/Target/TargetRegisterInfo.h +++ b/include/llvm/Target/TargetRegisterInfo.h @@ -376,7 +376,10 @@ public: /// /// Bits are numbered from the LSB, so the bit for physical register Reg can /// be found as (Mask[Reg / 32] >> Reg % 32) & 1. - /// NULL pointer is equivalent to an all-zero mask. + /// + /// A NULL pointer means that no register mask will be used, and call + /// instructions should use implicit-def operands to indicate call clobbered + /// registers. /// virtual const uint32_t *getCallPreservedMask(CallingConv::ID) const { // The default mask clobbers everything. All targets should override. -- cgit v1.1