Hello,
I am trying to compile for hardfloat.
When passing floats as parameters to a C-library function call,
I get incorrect values inside the library.
Both for singles as doubles.
If I write the same call to the c-library in c,
I get assembler like
call function test_param (int, single, single)
test_param (i,f1,f2);
ldr r0, [fp, #-8]
flds s0, [fp, #-12]
flds s1, [fp, #-16]
bl test_param
test_param (142,1.1,2.2);
mov r0, #142
flds s0, .L3
flds s1, .L3+4
bl test_param
In pascal I get the following assembler for this call
test_param(i,f1,f2);
ldr r0,.Lj10
ldr r2,[r0]
ldr r0,.Lj6
ldr r1,[r0]
ldr r0,.Lj13
ldr r0,[r0]
blx test_param
test_param(142,1.1,2.2);
ldr r2,.Lj5
ldr r1,.Lj8
mov r0,#142
blx test_param
blx FPC_DO_EXIT
ldmea r11,{r11,r13,r15}
.Lj5:
.byte 205,204,12,64
.Lj8:
.byte 205,204,140,63
Pascal compiler options like
fpc -Aas -O- -CfVFPv3 -Cparmv7 -CaEABI pmain.pp
or
fpc -Aas -dFPC_ARMEL -O- -dFPC_ABI_EABI -CfVFPv3 -Cparmv7 -CaEABI pmain
using fpc svn fixes_2_6 Revision: 22520
G++ calls as with -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16 -meabi=5
and is configured with
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/4.7.1/lto-
wrapper
Target: armv7l-unknown-linux-gnueabihf
Configured with: /build/src/gcc-4.7-20120721/configure --prefix=/usr --
libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --
infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-
languages=c,c++,fortran,lto,objc,obj-c++ --enable-shared --enable-
threads=posix --with-system-zlib --enable-__cxa_atexit --disable-libunwind-
exceptions --enable-clocale=gnu --disable-libstdcxx-pch --enable-libstdcxx-
time --enable-gnu-unique-object --enable-linker-build-id --with-ppl --enable-
cloog-backend=isl --disable-ppl-version-check --disable-cloog-version-check --
enable-lto --enable-gold --enable-ld=default --enable-plugin --with-plugin-
ld=ld.gold --with-linker-hash-style=gnu --disable-multilib --disable-libssp --
disable-build-with-cxx --disable-build-poststage1-with-cxx --enable-
checking=release --host=armv7l-unknown-linux-gnueabihf --build=armv7l-unknown-
linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16
Thread model: posix
gcc version 4.7.1 20120721 (prerelease) (GCC)
$ fpc -i
Free Pascal Compiler version 2.6.1
Compiler Date : 2012/10/03
Compiler CPU Target: arm
<snip>
Supported CPU instruction sets:
ARMV3
ARMV4
ARMV5
ARMV6
ARMV7
ARMV7M
CORTEXM3
Supported FPU instruction sets:
SOFT
LIBGCC
FPA
FPA10
FPA11
VFPV2
VFPV3
Supported ABI targets:
DEFAULT
SYSV
AIX
EABI
ARMEB
<snip>
Platform: Beaglebone
$ cat /proc/cpuinfo
Processor : ARMv7 Processor rev 2 (v7l)
BogoMIPS : 498.89
Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc08
CPU revision : 2
Hardware : am335xevm
Revision : 0000
Serial : 0000000000000000
Kind regards,
Den Jean
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