[Bug target/59814] New: powerpc64le ICE with -O2 -mpower8 -ffast-math

[Bug target/59814] New: powerpc64le ICE with -O2 -mpower8 -ffast-math

[anton at samba dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59814

            Bug ID: 59814
           Summary: powerpc64le ICE with -O2 -mpower8 -ffast-math
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anton at samba dot org

The following test case:

/* -O2 -mcpu=power8 -ffast-math */

float val;
int verbose;

void bar(float x);

void foo(void)
{
        if (val < 0.0) {
                val = 1.0;
                if (!verbose)
                        zot();
                bar(val);
        }
}

fails with:

# gcc -c -O2 -mcpu=power8 -ffast-math testcase.c
testcase.c: In function ‘foo’:
testcase.c:16:1: error: unrecognizable insn:
 }
 ^
(insn 52 16 3 3 (parallel [
            (set (reg:SF 33 1 [orig:125 D.2152 ] [125])
                (unspec:SF [
                        (reg:SF 9 9 [131])
                    ] UNSPEC_P8V_RELOAD_FROM_GPR))
            (clobber (reg:DI 8 8))
        ]) -1
     (nil))
testcase.c:16:1: internal compiler error: in extract_insn, at recog.c:2154
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From: "virkony at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59813] tail-call elimintation didn't fired with left-shift of char to cout
Date: Tue, 14 Jan 2014 21:59:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY813

--- Comment #1 from Nikolay Orliuk <virkony at gmail dot com> ---
In 4.7.3 that code works, but changing it to

void foo()
{
    cout << "x" << endl; // ok
    cout << 'x' << endl; // kills tail-call elimination in gcc 4.8.2
    struct {} bar; // kills tail-call elimination in 4.7.3
    foo();
}

Removing either "bar" or 'x' results in normal infinite loop.
In 4.5.4 this works fine as is.

[Bug target/59814] powerpc64le ICE with -O2 -mpower8 -ffast-math

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59814

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amodra at gmail dot com

--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
Created attachment 31835
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31835&action=edit
make rs6000.c match rs6000.md

This patch simply avoids the ICE by ensuring we don't generate these insns in
the first place.  The insns currently have && WORDS_BIG_ENDIAN in their
predicates.

[Bug target/59814] powerpc64le ICE with -O2 -mpower8 -ffast-math

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59814

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE
   Target Milestone|---                         |4.9.0

--- Comment #2 from Alan Modra <amodra at gmail dot com> ---
Fix by rev 206668

*** This bug has been marked as a duplicate of bug 59844 ***