[PATCH, 0/2] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump

[Tom de Vries]

Hi,

Consider an lto multi-source test-case main.c and foo.c:
..
$ cat main.c
extern int foo (void);
int
main ()
{
  return foo () + 1;
}

$ cat foo.c
int __attribute__((noinline, noclone))
foo (void)
{
  return 2;
}
...

When compiling the test-case like this:
...
$ gcc main.c foo.c -O2 -flto -save-temps -flto-partition=1to1 -o a.out
...

the following happens:
1. main.s (containing gimple) is produced
   (and then assembled to main.o)
2. foo.s (containing gimple) is produced
   (and then assembled to main.o)
3. lto1 is called in wpa mode, generating a.out.ltrans0.o and
   a.out.ltrans1.o
4. lto1 is called in ltrans mode, generating a.out.ltrans0.s
   (which is then assembled to a.out.ltrans0.ltrans.o)
5. lto1 is called in ltrans mode, generating a.out.ltrans1.s
   (which is then assembled to a.out.ltrans1.ltrans.o)
6. a.out is produced from a.out.ltrans0.ltrans.o and
   a.out.ltrans1.ltrans.o

When adding dump flags "-fdump-tree-all -fdump-rtl-all -fdump-ipa-all" 
to the command line, we get the following dump files.

For 1, we generate (ignoring the 000i.* and statistics dumps from here on):
- main.c.003t.original - main.c.050t.local-fnsummary2
- main.c.062i.targetclone - main.c.080i.pure-const

For 2, we generate:
- foo.c.003t.original - foo.c.050t.local-fnsummary2
- foo.c.062i.targetclone - foo.c.080i.pure-const

For 3, we generate:
- a.out.wpa.046t.profile_estimate
- a.out.wpa.071i.whole-program - a.out.wpa.084i.comdats

For 4, we generate:
- a.out.ltrans0.046t.profile_estimate
- a.out.ltrans0.075i.cp - a.out.ltrans0.087i.simdclone
- a.out.ltrans0.088t.fixup_cfg4 - a.out.ltrans0.232t.optimized
- a.out.ltrans0.234r.expand - a.out.ltrans0.317r.dfinish

For 5, we generate:
- a.out.ltrans1.046t.profile_estimate
- a.out.ltrans1.075i.cp - a.out.ltrans1.087i.simdclone
- a.out.ltrans1.088t.fixup_cfg4 - a.out.ltrans1.232t.optimized
- a.out.ltrans1.234r.expand - a.out.ltrans1.317r.dfinish

With the current set of dg-final commands scan-tree-dump, scan-rtl-dump 
and scan-ipa-dump, we are able to scan dump files for 1 and 2, but not 
for 3, 4 and 5.


This patch series adds:
- scan-wpa-ipa-dump, which allows us to scan the ipa dump files for 3
- scan-ltrans-tree-dump, which:
  - allows us to scan the tree dump files for 4, and
  - adds the option -flto-partition=one which forces wpa to combine
    all functions into a single partition ltrans0 (so that we don't have
    to worry about ltrans1 in 5).

Thanks,
- Tom