[Bug target/20018] New: [4.0 regression] unable to find a register to spill in class ‘PR_REGS’

[Bug target/20018] New: [4.0 regression] unable to find a register to spill in class ‘PR_REGS’

[schwab at suse dot de]

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This is another fallout from the simplify-rtx.c change, where the fix for the fix causes another regression:

       * simplify-rtx.c (simplify_relational_operation_1): Avoid creating
       zero extensions of BImode operands.  Call lowpart_subreg instead
       of gen_lowpart_common and gen_lowpart_SUBREG.

$ gcc/xgcc -Wall -B gcc/ -O2 -S ex_getln.i 
ex_getln.i: In function ‘getcmdline’:
ex_getln.i:4475: error: unable to find a register to spill in class ‘PR_REGS’
ex_getln.i:4475: error: this is the insn:
(insn 5728 5721 5730 633 (set (reg:BI 262 p6 [2906])
        (ior:BI (reg:BI 262 p6 [2900])
            (subreg:BI (reg:SI 132 f4 [3004]) 0))) 63 {iorbi3} (insn_list:REG_DEP_TRUE 5721 (nil))
    (expr_list:REG_DEAD (reg:BI 262 p6 [2900])
        (nil)))
ex_getln.i:4475: internal compiler error: in spill_failure, at reload1.c:1872

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           Summary: [4.0 regression] unable to find a register to spill in
                    class ‘PR_REGS’
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: critical
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schwab at suse dot de
                CC: gcc-bugs at gcc dot gnu dot org,roger at eyesopen dot
                    com
GCC target triplet: ia64-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression] unable to find a register to spill in class ‘PR_REGS’

[schwab at suse dot de]

------- Additional Comments From schwab at suse dot de  2005-02-17 01:29 -------
Created an attachment (id=8209)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=8209&action=view)
Somewhat reduced testcase


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression] unable to find a register to spill in class`PR_REG'

[pinskia at gcc dot gnu dot org]

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-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.0 regression] unable to  |[4.0 regression] unable to
                   |find a register to spill in |find a register to spill in
                   |class ‘PR_REGS’         |class`PR_REG'
   Target Milestone|---                         |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression] unable to find a register to spill in class`PR_REG'

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression][ia64] unable to find a register to spill in class`PR_REG'

[steven at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
 GCC target triplet|ia64-suse-linux             |ia64
   Last reconfirmed|0000-00-00 00:00:00         |2005-02-23 09:22:12
               date|                            |
            Summary|[4.0 regression] unable to  |[4.0 regression][ia64]
                   |find a register to spill in |unable to find a register to
                   |class`PR_REG'               |spill in class`PR_REG'


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression][ia64] unable to find a register to spill in class`PR_REG'

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-02-23 18:21 -------
Subject: Bug 20018

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	sayle@gcc.gnu.org	2005-02-23 18:20:53

Modified files:
	gcc            : ChangeLog simplify-rtx.c 

Log message:
	PR target/20018
	PR rtl-optimization/20097
	* simplify-rtx.c (simplify_relational_operation_1): Avoid creating
	BImode SUBREGs of SImode registers which confuse the ia64 backend.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.7571&r2=2.7572
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/simplify-rtx.c.diff?cvsroot=gcc&r1=1.229&r2=1.230



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018

[Bug target/20018] [4.0 regression][ia64] unable to find a register to spill in class`PR_REG'

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-23 18:39 -------
Fixed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20018