[llvm-bugs] [Bug 41658] New: "cannot use inalloca attribute on a register parameter" after argpromoting x86_thiscallcc

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https://bugs.llvm.org/show_bug.cgi?id=41658

            Bug ID: 41658
           Summary: "cannot use inalloca attribute on a register
                    parameter" after argpromoting x86_thiscallcc
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm at inglorion.net
                CC: llvm-bugs at lists.llvm.org

The x86_thiscallcc calling convention passes the first parameter (expected to
be "this") in the ECX register. ArgumentPromotion can result in this first
parameter being elided. If this causes an inalloca parameter to end up in the
first slot, we try to pass that in a register, resulting in LLVM ERROR: cannot
use inalloca attribute on a register parameter.

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