Commit Graph

15 Commits

Author SHA1 Message Date
Ulrich Weigand
9a154bfe94 [PowerPC] Allow stack frames without parameter save area
The PPCFrameLowering::determineFrameLayout routine currently ensures
that every function that allocates a stack frame provides space for the
parameter save area (via PPCFrameLowering::getMinCallFrameSize).

This is actually not necessary.  There may be functions that never call
another routine but still allocate a frame; those do not require the
parameter save area.  In the future, with the ELFv2 ABI, even some
routines that do call other functions do not need to allocate the
parameter save area.

While it is not a bug to allocate the parameter area when it is not
needed, it is better to avoid it to save stack space.

Note that when any particular function call requires the parameter save
area, this space will already have been included by ABI code in the size
the CALLSEQ_START insn is annotated with, and therefore included in the
size returned by MFI->getMaxCallFrameSize().

This means that determineFrameLayout simply does not need to care about
the parameter save area.  (It still needs to ensure that every frame
provides the linkage area.)  This is implemented by this patch.

Note that this exposed a bug in the new fast-isel code where the parameter
area was *not* included in the CALLSEQ_START size; this is also fixed.

A couple of test cases needed to be adapted for the new (smaller) stack
frame size those tests now see.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211495 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-23 13:47:52 +00:00
Tim Northover
dcef6a7400 Fix FileCheck --check-prefix lines.
Various tests had sprung up over the years which had --check-prefix=ABC on the
RUN line, but "CHECK-ABC:" later on. This happened to work before, but was
strictly incorrect. FileCheck is getting stricter soon though.

Patch by Ron Ofir.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188173 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-12 12:43:26 +00:00
Hal Finkel
3fd0018af1 enable PPC register scavenging by default (update tests and remove some FIXMEs)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145819 91177308-0d34-0410-b5e6-96231b3b80d8
2011-12-05 17:55:17 +00:00
Chris Lattner
728ea19ece add some no-unwinds, other minor cleanups.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96756 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-21 20:33:20 +00:00
Dale Johannesen
f7801b493e Do not store R31 into the caller's link area on PPC.
This violates the ABI (that area is "reserved"), and
while it is safe if all code is generated with current
compilers, there is some very old code around that uses
that slot for something else, and breaks if it is stored
into.  Adjust testcases looking for current behavior.
I've verified that the stack frame size is right in all
testcases, whether it changed or not.  7311323.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89811 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-24 22:59:02 +00:00
Dan Gohman
fce288fc91 Eliminate more uses of llvm-as and llvm-dis.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81293 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-09 00:09:15 +00:00
Daniel Dunbar
d60054e512 Convert two gratuitous abuses of poor helpless CPU cycles to FileCheck.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79933 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-24 20:08:27 +00:00
Bill Wendling
2b65c4e7cc Update llc flags for PPC register scavenger.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48187 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-10 22:59:08 +00:00
Bill Wendling
3fab77eb25 Use -enable-ppc-regscavenger flag for these checks
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47916 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-04 23:16:26 +00:00
Bill Wendling
7194aaf738 This is the initial check-in for adding register scavenging to PPC. (Currently,
PPC-64 doesn't work.) This also lowers the spilling of the CR registers so that
it uses a register other than the default R0 register (the scavenger scrounges
for one). A significant part of this patch fixes how kill information is
handled.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47863 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-03 22:19:16 +00:00
Bill Wendling
cc4831849e Upgrade testcase.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47644 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-26 23:22:40 +00:00
Reid Spencer
c58ef0185b For PR1319: Upgrade to new test harness.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36087 91177308-0d34-0410-b5e6-96231b3b80d8
2007-04-15 21:17:45 +00:00
Jim Laskey
bc9154641b These tests all rely on using register mnemonics and thus must behave in the
world of darwin.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32725 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-21 00:01:42 +00:00
Reid Spencer
69ccadd753 Use the llvm-upgrade program to upgrade llvm assembly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32115 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-02 04:23:10 +00:00
Jim Laskey
64c32dd2ea Tests to verify PowerPC ABI.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31825 91177308-0d34-0410-b5e6-96231b3b80d8
2006-11-17 16:54:21 +00:00