Bug 48160 - prepare_call_arguments failed to handle subreg
Summary: prepare_call_arguments failed to handle subreg
Status: RESOLVED FIXED
Alias: None
Product: gcc
Classification: Unclassified
Component: debug (show other bugs)
Version: 4.7.0
: P3 normal
Target Milestone: 4.7.0
Assignee: Not yet assigned to anyone
URL: http://gcc.gnu.org/ml/gcc-patches/201...
Keywords:
Depends on:
Blocks:
 
Reported: 2011-03-16 22:32 UTC by H.J. Lu
Modified: 2011-03-17 19:51 UTC (History)
1 user (show)

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Description H.J. Lu 2011-03-16 22:32:15 UTC 
prepare_call_arguments failed to handle

(call_insn:TI 17 12 21 2 (set (reg:SI 0 ax)
        (call (mem:QI (symbol_ref:DI ("_ZN9__gnu_cxx17__pool_alloc_base17_M_allocate_chunkEmRi") [flags 0x3] <function_decl 0x7ffff0ac4500 _M_allocate_chunk>) [0 _M_allocate_chunk S1 A8])
            (const_int 0 [0]))) /export/gnu/import/git/gcc-x32/libstdc++-v3/src/pool_allocator.cc:136 935 {*call_value_0_rex64}
     (expr_list:REG_DEAD (reg:SI 5 di)
        (expr_list:REG_DEAD (reg:SI 4 si)
            (expr_list:REG_DEAD (reg:SI 1 dx)
                (nil))))
    (expr_list:REG_DEP_TRUE (use (reg:SI 5 di))
        (expr_list:REG_DEP_TRUE (use (reg:SI 4 si))
            (expr_list:REG_DEP_TRUE (use (reg:SI 1 dx))
                (nil)))))
(gdb) 

which leads to

(gdb) call debug_rtx (item)
(concat:SI (reg:SI 1 dx)
    (subreg:SI (value/u:DI 10:3917 @0x1c537e8/0x1c6de40) 0))
Comment 1 H.J. Lu 2011-03-16 22:48:30 UTC 
A patch is posed at

http://gcc.gnu.org/ml/gcc-patches/2011-03/msg00965.html
Comment 2 hjl@gcc.gnu.org 2011-03-17 19:51:06 UTC 
Author: hjl
Date: Thu Mar 17 19:51:03 2011
New Revision: 171108

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171108
Log:
Check SUBREG in prepare_call_arguments.

2011-03-17  H.J. Lu  <hongjiu.lu@intel.com>

	PR debug/48160
	* var-tracking.c (prepare_call_arguments): Check SUBREG.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/var-tracking.c
Comment 3 H.J. Lu 2011-03-17 19:51:57 UTC 
Fixed.