[Mingw-notify] [ mingw-Bugs-2811688 ] Bug in a sibling calls optimizer

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Bugs item #2811688, was opened at 2009-06-24 22:13
Message generated for change (Comment added) made by ivmai
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Category: gcc
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Ivan Maidanski (ivmai)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bug in a sibling calls optimizer

Initial Comment:
This seems to be a bug in a compiler (observed at least in v4.4.0, v4.2.1, v3.4.5).

Compiler output for the test.c compiled with -c -O1 -foptimize-sibling-calls (or -O2) :

test.c: In function 'f':
test.c:11: error: unable to find a register to spill in class 'CREG'
test.c:11: error: this is the insn:
(call_insn/j 14 13 15 2 test.c:10 (set (reg:SI 0 ax)
        (call (mem:QI (reg/f:SI 4 si [orig:59 D.1246 ] [59]) [0 S1 A8])
            (const_int 0 [0x0]))) 681 {*sibcall_value_1} (expr_list:REG_DEAD (reg/f:SI 4 si [orig:59 D.1246 ] [59])
        (expr_list:REG_DEAD (reg:SI 2 cx)
            (expr_list:REG_DEAD (reg:SI 1 dx)
                (nil))))
    (expr_list:REG_DEP_TRUE (use (reg:SI 2 cx))
        (expr_list:REG_DEP_TRUE (use (reg:SI 1 dx))
            (nil))))
test.c:11: confused by earlier errors, bailing out


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>Comment By: Ivan Maidanski (ivmai)
Date: 2009-06-25 16:01

Message:
The corresponding gcc bug entry (with a simpler test case):
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38900

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=102435&aid=2811688&group_id=2435