https://bugs.llvm.org/show_bug.cgi?id=45092
Bug ID: 45092
Summary: [SystemZ] - Valid instructions are rejected with "%r0
used in an address"
Product: libraries
Version: 9.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: SystemZ
Assignee: unassignedb...@nondot.org
Reporter: slavomir.kuc...@broadcom.com
CC: llvm-bugs@lists.llvm.org
Inline assembler parser for SystemZ rejects valid instructions when %r0 is used
as an operands.
Examples of this would be:
- basr %r2,%r0
- bsm %r2,%r0
- lae %r2,0(%r14,%r0)
https://godbolt.org/z/wY8VqC
- All of these examples are valid and have a use-case,
- GCC accepts them,
- in AR-mode the order of index and base register actually matters (0(%r14,%r0)
operates on primary, 0(%r0,%r14) operates on whatever ar14 points to).
- the instructions can be coded e.g. as templates (like targets for EX/EXRL).
My preferred solution is to just remove the checks in the parser
(SystemZAsmParser.cpp).
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