Command line:
valgrind --trace-children=yes gcc -O1 -ftree-loop-linear -c testcase.c
Tested revisions:
trunk r156367 - fail
trunk r155363 - fail
trunk r153685 - fail
4.4 r156256 - fail
4.4 r155966 - fail
4.4 r155463 - fail
4.4 r155365 - fail
4.4 r154975 - fail
4.4 r153668 - OK
4.4 r149995 - OK
4.4.2 (gentoo) - OK
4.3.4 (gentoo) - fail
Output:
$ valgrind --track-origins=yes
/mnt/svn/gcc-trunk/binary-156367-lto/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/cc1
-O1 -ftree-loop-linear jquant2-noempty.i
...
Analyzing compilation unit
Performing interprocedural optimizations
<visibility> <*free_lang_data> <early_local_cleanups> <whole-program> <inline>
<static-var> <pure-const>Assembling functions:
prescan_quantize update_box==15347== Conditional jump or move depends on
uninitialised value(s)
==15347== at 0x61E845: mul_double_with_sign (fold-const.c:422)
==15347== by 0xBE645C: double_int_mul (double-int.c:179)
==15347== by 0xC63273: linear_transform_loops (tree-loop-linear.c:249)
==15347== by 0x8955A6: tree_linear_transform (tree-ssa-loop.c:261)
==15347== by 0x72261A: execute_one_pass (passes.c:1561)
==15347== by 0x7228A4: execute_pass_list (passes.c:1616)
==15347== by 0x7228B6: execute_pass_list (passes.c:1617)
==15347== by 0x7228B6: execute_pass_list (passes.c:1617)
==15347== by 0x818364: tree_rest_of_compilation (tree-optimize.c:413)
==15347== by 0x9997D0: cgraph_expand_function (cgraphunit.c:1543)
==15347== by 0x99C1F4: cgraph_optimize (cgraphunit.c:1622)
==15347== by 0x99C754: cgraph_finalize_compilation_unit (cgraphunit.c:1093)
==15347== Uninitialised value was created by a stack allocation
==15347== at 0xC62B71: linear_transform_loops (tree-loop-linear.c:317)
==15347==
==15347== Conditional jump or move depends on uninitialised value(s)
==15347== at 0x61E854: mul_double_with_sign (fold-const.c:427)
==15347== by 0xBE645C: double_int_mul (double-int.c:179)
==15347== by 0xC63273: linear_transform_loops (tree-loop-linear.c:249)
==15347== by 0x8955A6: tree_linear_transform (tree-ssa-loop.c:261)
==15347== by 0x72261A: execute_one_pass (passes.c:1561)
==15347== by 0x7228A4: execute_pass_list (passes.c:1616)
==15347== by 0x7228B6: execute_pass_list (passes.c:1617)
==15347== by 0x7228B6: execute_pass_list (passes.c:1617)
==15347== by 0x818364: tree_rest_of_compilation (tree-optimize.c:413)
==15347== by 0x9997D0: cgraph_expand_function (cgraphunit.c:1543)
==15347== by 0x99C1F4: cgraph_optimize (cgraphunit.c:1622)
==15347== by 0x99C754: cgraph_finalize_compilation_unit (cgraphunit.c:1093)
==15347== Uninitialised value was created by a stack allocation
==15347== at 0xC62B71: linear_transform_loops (tree-loop-linear.c:317)
==15347==
fill_inverse_cmap {GC 5348k -> 2791k} pass2_no_dither pass2_fs_dither
init_error_limit finish_pass1 finish_pass2 new_color_map_2_quant
start_pass_2_quant jinit_2pass_quantizer
--
Summary: -ftree-loop-linear - valgrind warns about using
uninitialized variable
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: zsojka at seznam dot cz
GCC host triplet: x86(_64)-pc-linux-gnu
GCC target triplet: x86(_64)-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42931
