tree aae44d9bce886521bc19d985a5a3b9188b96806d
parent fde937748b7def9f9d349b85bf9077f07a84b724
author Hsiangkai Wang <kai.wang@sifive.com> 1637331985 +0800
committer Hsiangkai Wang <kai.wang@sifive.com> 1638239974 +0800

[RISCV] Add a test case to show the bug in RISCVFrameLowering.

If the number of arguments is too large to use register passing, it
needs to occupy stack space to pass the arguments to the callee. There
are two scenarios. One is to reserve the space in prologue and the other
is to reserve the space before the function calls. When we need to
reserve the stack space before function calls, the stack pointer is
adjusted. Under the scenario, we should not use stack pointer to access
the stack objects. It looks like,

callseq_start  ->  sp = sp - reserved_space
//
// We should not use SP to access stack objects in this area.
//
call @foo
callseq_end    ->  sp = sp + reserved_space

Differential Revision: https://reviews.llvm.org/D114245