https://bugs.llvm.org/show_bug.cgi?id=34550
Bug ID: 34550
Summary: Superregs are not automatically inferred into the
callee saved regs list
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
Although the SystemZ backend adds e.g. %R6 and %R7 to the CalleeSavedRegs list,
it is still needed to add %R6Q (the 128 bit super register of exactly those two
registers) to the list explicitly. This should not be necessary, since both the
subregs are already in the list.
Adding only the 128-bit regs gives unexpected results, see discussion:
http://lists.llvm.org/pipermail/llvm-dev/2017-August/116570.html
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