Given the appended input this code gets generated by gcc 3.4 / 4.0 / 4.1
version when launched by "g++ matrix.cpp -o matrix -O2 -Wall -Wextra -pedantic
-std=c++98 -save-temps":
.LCFI2:
leal -48(%ebp), %ecx
leal -88(%ebp), %ebx
subl $100, %esp
.LCFI3:
movl $1, -48(%ebp)
movl $2, -44(%ebp)
andl $-16, %esp
movl $3, -40(%ebp)
movl $4, -36(%ebp)
subl $16, %esp
movl $5, -32(%ebp)
movl $6, -28(%ebp)
movl $7, -24(%ebp)
movl $8, -20(%ebp)
movl $9, -16(%ebp)
movl $10, -12(%ebp)
.p2align 4,,7
could be replaced by
.LCFI2:
leal -48(%ebp), %ecx
leal -88(%ebp), %ebx
.LCFI3:
movl $1, -48(%ebp)
movl $2, -44(%ebp)
movl $3, -40(%ebp)
movl $4, -36(%ebp)
movl $5, -32(%ebp)
movl $6, -28(%ebp)
movl $7, -24(%ebp)
movl $8, -20(%ebp)
movl $9, -16(%ebp)
movl $10, -12(%ebp)
.p2align 4,,7
Since esp won't be accessed in the remaining program.
gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1-20050528/configure --prefix=/import/share/tools
--with-local-prefix=/import/share/tools --with-arch=athlon
--enable-version-specific-runtime-libs --enable-languages=c,c++
--program-suffix=-4.1 --disable-werror
Thread model: posix
gcc version 4.1.0 20050528 (experimental)
--
Summary: strange code generation
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: other
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: alonsoschaich at gmx dot de
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21863
