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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-02 23:52:57 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-02 23:52:57 +0000 |
| commit | 478a8a02bc0f2e739ed8f4240152e99837e480b9 (patch) | |
| tree | 47ab92f4d7d9d548d79b78837040b3da3ccba482 /include/llvm/Target | |
| parent | 2e5b88e3cbb9438b5b9d3a1dc499b11a144ca7d2 (diff) | |
| download | external_llvm-478a8a02bc0f2e739ed8f4240152e99837e480b9.zip external_llvm-478a8a02bc0f2e739ed8f4240152e99837e480b9.tar.gz external_llvm-478a8a02bc0f2e739ed8f4240152e99837e480b9.tar.bz2 | |
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
Diffstat (limited to 'include/llvm/Target')
| -rw-r--r-- | include/llvm/Target/TargetRegisterInfo.h | 5 |
1 files changed, 4 insertions, 1 deletions
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. |