When we are realigning the stack pointer, making an ms_abi to sysv_abi
call and allocating 2GiB or more on the stack we end up with an invalid
INSN due to a non-immediate offset. This occurs both with and without
-mcall-ms2sysv-xlogues. Additionally, the stack allocation with
-mcall-ms2sysv-xlogues is ignoring (silently disabling) stack checking,
stack clash checking and probing.
This patch fixes these problems by:
1. No longer allocate stack space in ix86_emit_outlined_ms2sysv_save.
2. Rearrange where we emit SSE saves or stub call:
a. Before frame allocation when offset from frame to save area is >= 2GiB.
b. After frame allocation when frame is < 2GiB. (Stack allocations
prior to the stub call can't be combined with those afterwards, so
this is better when possible.)
3. Modify choose_baseaddr to take an optional scratch_regno argument
and never return rtx that cannot be used as an immediate.
gcc:
config/i386/i386.c (choose_basereg): Use optional scratch
register and add assertion.
(x86_emit_outlined_ms2sysv_save): Use scratch register when
needed, and don't allocate stack.
(ix86_expand_prologue): Rearrange where SSE saves/stub call is
emitted, correct wrong allocation with -mcall-ms2sysv-xlogues.
(ix86_emit_outlined_ms2sysv_restore): Fix non-immediate offsets.
gcc/testsuite:
gcc.target/i386/pr82002-2a.c: Change from xfail to fail.
gcc.target/i386/pr82002-2b.c: Likewise.
From-SVN: r254412
