Hi,
gcc-4.1.0 miscompiles on sh4-linux target.
Attached testcase does not trigger this bug on mainline,
and also correctly compiled with gcc-3.4.5.
For attached testcase, source line 514 is incorrectly compiled with
following command line.
g++ -O2 -g -fno-strict-aliasing -fwrapv \
-fno-implicit-templates -fno-exceptions -fno-rtti -S -o bad.s sql_select4.ii
incorrect result:
.loc 1 515 0
mov.l @(52,r14),r2
.loc 1 514 0
add #12,r1
.loc 1 515 0
mov.l r2,@-r1
.loc 1 514 0
mov #0,r2
mov.l r2,@r1 <===== #0 is stored incorrect address
("add #4,r1" is needed bofore this
line)
Adding -fno-schedule-insns fixes this.
g++ -O2 -g -fno-schedule-insns -fno-strict-aliasing -fwrapv \
-fno-implicit-templates -fno-exceptions -fno-rtti -S -o good.s
sql_select4.ii
correct result:
mov #0,r2
.....
fmov.s fr6,@r1
fmov.s fr7,@-r1
.loc 1 514 0
add #12,r1
mov.l r2,@r1
.loc 1 515 0
mov.l @(52,r14),r7
mov.l r7,@-r1
On mainline, this problem disapeares after following patch.
2005-11-30 Paolo Bonzini <[EMAIL PROTECTED]>
* simplify-rtx.c (simplify_plus_minus): Remove final parameter.
Always produce an output if we can remove NEGs or canonicalize
(minus (minus ...)) expressions. Provide a fast path for the
two-operand case.
(simplify_gen_binary): Do not call simplify_plus_minus.
(simplify_binary_operation_1): Reassociate at the end of the
function.
--
Summary: [4.1 regression] SH: wrong-code generation
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sugioka at itonet dot co dot jp
GCC build triplet: sh4-unknown-linux
GCC host triplet: sh4-unknown-linux
GCC target triplet: sh4-unknown-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27182
