From: Thomas Preud'homme Date: Wed, 19 Dec 2018 17:34:18 +0000 (+0000) Subject: [ARM] Optimize executable size when using softfloat fmul/dmul X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=72e3a529238a86235f74f563d13f27b26b2b816b;p=gcc.git [ARM] Optimize executable size when using softfloat fmul/dmul Softfloat single precision and double precision floating-point multiplication routines in libgcc share some code with the floating-point division of their corresponding precision. As the code is structured now, this leads to *all* division code being pulled in an executable in softfloat mode even if only multiplication is performed. This patch create some new LIB1ASMFUNCS macros to also build files with just the multiplication and shared code as weak symbols. By putting these earlier in the static library, they can then be picked up when only multiplication is used and they are overriden by the global definition in the existing file containing both multiplication and division code when division is needed. The patch also removes changes made to the FUNC_START and ARM_FUNC_START macros in r218124 since the intent was to put multiplication and division code into their own section in a later patch to achieve the same size optimization. That approach relied on specific section layout to ensure multiplication and division were not too far from the shared bit of code in order to the branches to be within range. Due to lack of guarantee regarding section layout, in particular with all the possibility of linker scripts, this approach was chosen instead. This patch keeps the two testcases that were posted by Tony Wang on the mailing list to implement this approach and adds a new one. 2018-12-19 Thomas Preud'homme libgcc/ * /config/arm/lib1funcs.S (FUNC_START): Remove unused sp_section parameter and corresponding code. (ARM_FUNC_START): Likewise in both definitions. Also update footer comment about condition that need to match with gcc/config/arm/elf.h to also include libgcc/config/arm/t-arm. * config/arm/ieee754-df.S (muldf3): Also build it if L_arm_muldf3 is defined. Weakly define it in this case. * config/arm/ieee754-sf.S (mulsf3): Likewise with L_arm_mulsf3. * config/arm/t-elf (LIB1ASMFUNCS): Build _arm_muldf3.o and _arm_mulsf3.o before muldiv versions if targeting Thumb-1 only. Add comment to keep condition in sync with the one in libgcc/config/arm/lib1funcs.S and gcc/config/arm/elf.h. gcc/ * config/arm/elf.h: Update comment about condition that need to match with libgcc/config/arm/lib1funcs.S to also include libgcc/config/arm/t-arm. * doc/sourcebuild.texi (output-exists, output-exists-not): Rename subsubsection these directives are in to "Check for output files". Move scan-symbol to that section and add to it new scan-symbol-not directive. 2018-12-19 Tony Wang Thomas Preud'homme gcc/testsuite/ * lib/lto.exp (lto-execute): Define output_file and testname_with_flags to same value as execname. (scan-symbol): Move and rename to ... * lib/gcc-dg.exp (scan-symbol-common): This. Adapt into a helper function returning true or false if a symbol is present. (scan-symbol): New procedure. (scan-symbol-not): Likewise. * gcc.target/arm/size-optimization-ieee-1.c: New testcase. * gcc.target/arm/size-optimization-ieee-2.c: Likewise. * gcc.target/arm/size-optimization-ieee-3.c: Likewise. From-SVN: r267282 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 365d5931bcf..53cdc837a5c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2018-12-19 Thomas Preud'homme + + * config/arm/elf.h: Update comment about condition that need to + match with libgcc/config/arm/lib1funcs.S to also include + libgcc/config/arm/t-arm. + * doc/sourcebuild.texi (output-exists, output-exists-not): Rename + subsubsection these directives are in to "Check for output files". + Move scan-symbol to that section and add to it new scan-symbol-not + directive. + 2018-12-19 Tom de Vries * config/nvptx/nvptx.c (PTX_CTA_SIZE): Define. diff --git a/gcc/config/arm/elf.h b/gcc/config/arm/elf.h index ad3651ba841..1e00e99afc6 100644 --- a/gcc/config/arm/elf.h +++ b/gcc/config/arm/elf.h @@ -137,7 +137,7 @@ /* Horrible hack: We want to prevent some libgcc routines being included for some multilibs. The condition should match the one in - libgcc/config/arm/lib1funcs.S. */ + libgcc/config/arm/lib1funcs.S and libgcc/config/arm/t-elf. */ #if __ARM_ARCH_ISA_ARM || __ARM_ARCH_ISA_THUMB != 1 #undef L_fixdfsi #undef L_fixunsdfsi diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi index 46ef388e109..29c693b9644 100644 --- a/gcc/doc/sourcebuild.texi +++ b/gcc/doc/sourcebuild.texi @@ -2668,7 +2668,7 @@ Passes if @var{regex} does not match demangled text in the dump file with suffix @var{suffix}. @end table -@subsubsection Verify that an output files exists or not +@subsubsection Check for output files @table @code @item output-exists [@{ target/xfail @var{selector} @}] @@ -2676,13 +2676,12 @@ Passes if compiler output file exists. @item output-exists-not [@{ target/xfail @var{selector} @}] Passes if compiler output file does not exist. -@end table - -@subsubsection Check for LTO tests -@table @code @item scan-symbol @var{regexp} [@{ target/xfail @var{selector} @}] Passes if the pattern is present in the final executable. + +@item scan-symbol-not @var{regexp} [@{ target/xfail @var{selector} @}] +Passes if the pattern is absent from the final executable. @end table @subsubsection Checks for @command{gcov} tests diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d1ebfc7c346..e199cd09728 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,17 @@ +2018-12-19 Tony Wang + Thomas Preud'homme + + * lib/lto.exp (lto-execute): Define output_file and testname_with_flags + to same value as execname. + (scan-symbol): Move and rename to ... + * lib/gcc-dg.exp (scan-symbol-common): This. Adapt into a + helper function returning true or false if a symbol is present. + (scan-symbol): New procedure. + (scan-symbol-not): Likewise. + * gcc.target/arm/size-optimization-ieee-1.c: New testcase. + * gcc.target/arm/size-optimization-ieee-2.c: Likewise. + * gcc.target/arm/size-optimization-ieee-3.c: Likewise. + 2018-12-19 Segher Boessenkool * g++.dg/asm-qual-3.C: New testcase. diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c new file mode 100644 index 00000000000..34090f20fec --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-1.c @@ -0,0 +1,33 @@ +/* { dg-do link { target arm_soft_ok } } */ +/* { dg-options "-mfloat-abi=soft" } */ + +int +foo (void) +{ + volatile float a; + volatile float b; + volatile float c = a * b; + return 0; +} + +int +bar (void) +{ + volatile double a; + volatile double b; + volatile double c = a * b; + return 0; +} + +int +main (void) +{ + foo (); + bar (); + return 0; +} + +/* { dg-final { scan-symbol "__aeabi_fmul" } } */ +/* { dg-final { scan-symbol "__aeabi_dmul" } } */ +/* { dg-final { scan-symbol-not "__aeabi_fdiv" } } */ +/* { dg-final { scan-symbol-not "__aeabi_ddiv" } } */ diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c new file mode 100644 index 00000000000..75337894a9c --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-2.c @@ -0,0 +1,31 @@ +/* { dg-do link { target arm_soft_ok } } */ +/* { dg-options "-mfloat-abi=soft" } */ + +int +foo (void) +{ + volatile float a; + volatile float b; + volatile float c = a / b; + return 0; +} + +int +bar (void) +{ + volatile double a; + volatile double b; + volatile double c = a / b; + return 0; +} + +int +main (void) +{ + foo (); + bar (); + return 0; +} + +/* { dg-final { scan-symbol "__aeabi_fdiv" } } */ +/* { dg-final { scan-symbol "__aeabi_ddiv" } } */ diff --git a/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c new file mode 100644 index 00000000000..63c92b3bbb7 --- /dev/null +++ b/gcc/testsuite/gcc.target/arm/size-optimization-ieee-3.c @@ -0,0 +1,33 @@ +/* { dg-do link { target arm_soft_ok } } */ +/* { dg-options "-mfloat-abi=soft" } */ + +int +foo (void) +{ + volatile float a; + volatile float b; + volatile float c = a * b + a / b; + return 0; +} + +int +bar (void) +{ + volatile double a; + volatile double b; + volatile double c = a * b + a / b; + return 0; +} + +int +main (void) +{ + foo (); + bar (); + return 0; +} + +/* { dg-final { scan-symbol "__aeabi_fmul" } } */ +/* { dg-final { scan-symbol "__aeabi_dmul" } } */ +/* { dg-final { scan-symbol "__aeabi_fdiv" } } */ +/* { dg-final { scan-symbol "__aeabi_ddiv" } } */ diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp index 054d8848abc..e47f80de3f4 100644 --- a/gcc/testsuite/lib/gcc-dg.exp +++ b/gcc/testsuite/lib/gcc-dg.exp @@ -1244,5 +1244,81 @@ proc gdb-exists { args } { return 0; } +# Helper function for scan-symbol and scan-symbol-not. It scans a symbol in +# the final executable and return 1 if present, otherwise fail. +# +# Argument 0 is the regexp to match. +# Argument 1 handles expected failures and the like +proc scan-symbol-common { scan_directive args } { + global nm + global base_dir + + # Access variable from gcc-dg-test-1 or lto-execute. + upvar 3 output_file output_file + + if { [llength $args] >= 2 } { + switch [dg-process-target [lindex $args 1]] { + "S" { } + "N" { return } + "F" { setup_xfail "*-*-*" } + "P" { } + } + } + + # Find nm like we find g++ in g++.exp. + if ![info exists nm] { + set nm [findfile $base_dir/../../../binutils/nm \ + $base_dir/../../../binutils/nm \ + [findfile $base_dir/../../nm $base_dir/../../nm \ + [findfile $base_dir/nm $base_dir/nm \ + [transform nm]]]] + verbose -log "nm is $nm" + } + + set output_file "[glob -nocomplain $output_file]" + if { $output_file == "" } { + fail "$scan_directive $args: output file does not exist" + return + } + + set fd [open "| $nm $output_file" r] + set text [read $fd] + close $fd + + if [regexp -- [lindex $args 0] $text] { + return 1 + } else { + return 0 + } +} + +# Utility for scanning a symbol in the final executable, invoked via dg-final. +# Call pass if pattern is present, otherwise fail. +# +# Argument 0 is the regexp to match. +# Argument 1 handles expected failures and the like +proc scan-symbol { args } { + set testcase [testname-for-summary] + if { [scan-symbol-common "scan-symbol" $args]} { + pass "$testcase scan-symbol $args" + } else { + fail "$testcase scan-symbol $args" + } +} + +# Utility for scanning a symbol in the final executable, invoked via dg-final. +# Call pass if pattern is absent, otherwise fail. +# +# Argument 0 is the regexp to match. +# Argument 1 handles expected failures and the like +proc scan-symbol-not { args } { + set testcase [testname-for-summary] + if { [scan-symbol-common "scan-symbol-not" $args]} { + fail "$testcase scan-symbol-not $args" + } else { + pass "$testcase scan-symbol-not $args" + } +} + set additional_prunes "" set dg_runtest_extra_prunes "" diff --git a/gcc/testsuite/lib/lto.exp b/gcc/testsuite/lib/lto.exp index 58a84aa1936..c2c35698827 100644 --- a/gcc/testsuite/lib/lto.exp +++ b/gcc/testsuite/lib/lto.exp @@ -712,6 +712,17 @@ proc lto-execute { src1 sid } { # There's a unique name for each executable we generate. set execname "${execbase}-${count}1.exe" + + # The LTO tests don't use dg-test, so testname_with_flags and + # output_file need to be defined explicitly for each file. scan-symbol + # directives rely on both of these to be defined to find the symbol to + # scan and for the text to print in the PASS/FAIL since they can also + # be called from dg-test. testname_with_flags is also used via + # testname-for-summary when calling into generic function below to + # clean temporary files. + set output_file $execname + set testname_with_flags $execname + incr count file_on_host delete $execname @@ -774,11 +785,7 @@ proc lto-execute { src1 sid } { } } - # Clean up after -save-temps. The LTO tests don't use dg-test, so - # testname-for-summary needs to be defined explicitly for each - # file that needs to be removed. - set testname_with_flags $execname - + # Clean up after -save-temps. eval "cleanup-saved-temps" for {set i 0} {$i < $num_srcs} {incr i} { @@ -801,52 +808,6 @@ proc lto-execute { src1 sid } { } } -# Utility for scanning a symbol in the final executable, invoked via dg-final. -# Call pass if pattern is present, otherwise fail. -# -# Argument 0 is the regexp to match. -# Argument 1 handles expected failures and the like -proc scan-symbol { args } { - global nm - global base_dir - upvar 2 execname execname - - if { [llength $args] >= 2 } { - switch [dg-process-target [lindex $args 1]] { - "S" { } - "N" { return } - "F" { setup_xfail "*-*-*" } - "P" { } - } - } - - # Find nm like we find g++ in g++.exp. - if ![info exists nm] { - set nm [findfile $base_dir/../../../binutils/nm \ - $base_dir/../../../binutils/nm \ - [findfile $base_dir/../../nm $base_dir/../../nm \ - [findfile $base_dir/nm $base_dir/nm \ - [transform nm]]]] - verbose -log "nm is $nm" - } - - set output_file "[glob -nocomplain $execname]" - if { $output_file == "" } { - fail "scan-symbol $args: dump file does not exist" - return - } - - set fd [open "| $nm $output_file" r] - set text [read $fd] - close $fd - - if [regexp -- [lindex $args 0] $text] { - pass "scan-symbol $args" - } else { - fail "scan-symbol $args" - } -} - # Call pass if object readelf is ok, otherwise fail. # example: /* { dg-final { object-readelf Tag_ABI_enum_size int} } */ proc object-readelf { args } { diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 2075567766d..1879424524d 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,3 +1,18 @@ +2018-12-19 Thomas Preud'homme + + * /config/arm/lib1funcs.S (FUNC_START): Remove unused sp_section + parameter and corresponding code. + (ARM_FUNC_START): Likewise in both definitions. + Also update footer comment about condition that need to match with + gcc/config/arm/elf.h to also include libgcc/config/arm/t-arm. + * config/arm/ieee754-df.S (muldf3): Also build it if L_arm_muldf3 is + defined. Weakly define it in this case. + * config/arm/ieee754-sf.S (mulsf3): Likewise with L_arm_mulsf3. + * config/arm/t-elf (LIB1ASMFUNCS): Build _arm_muldf3.o and + _arm_mulsf3.o before muldiv versions if targeting Thumb-1 only. Add + comment to keep condition in sync with the one in + libgcc/config/arm/lib1funcs.S and gcc/config/arm/elf.h. + 2018-12-18 Wei Xiao * config/i386/cpuinfo.c (get_intel_cpu): Handle cascadelake. diff --git a/libgcc/config/arm/ieee754-df.S b/libgcc/config/arm/ieee754-df.S index 480e33da31f..1765c5f1f60 100644 --- a/libgcc/config/arm/ieee754-df.S +++ b/libgcc/config/arm/ieee754-df.S @@ -617,7 +617,18 @@ ARM_FUNC_ALIAS aeabi_l2d floatdidf #endif /* L_addsubdf3 */ -#ifdef L_arm_muldivdf3 +#if defined(L_arm_muldf3) || defined(L_arm_muldivdf3) + +@ Define multiplication as weak in _arm_muldf3.o so that it can be overriden +@ by the global definition in _arm_muldivdf3.o. This allows a program only +@ using multiplication to take the weak definition which does not contain the +@ division code. Programs using only division or both division and +@ multiplication will pull _arm_muldivdf3.o from which both the multiplication +@ and division are taken thanks to the override. +#ifdef L_arm_muldf3 +WEAK muldf3 +WEAK aeabi_dmul +#endif ARM_FUNC_START muldf3 ARM_FUNC_ALIAS aeabi_dmul muldf3 @@ -870,6 +881,8 @@ LSYM(Lml_n): FUNC_END aeabi_dmul FUNC_END muldf3 +#ifdef L_arm_muldivdf3 + ARM_FUNC_START divdf3 ARM_FUNC_ALIAS aeabi_ddiv divdf3 CFI_START_FUNCTION @@ -1067,6 +1080,7 @@ LSYM(Ldv_s): FUNC_END divdf3 #endif /* L_muldivdf3 */ +#endif /* L_arm_muldf3 || L_arm_muldivdf3 */ #ifdef L_arm_cmpdf2 diff --git a/libgcc/config/arm/ieee754-sf.S b/libgcc/config/arm/ieee754-sf.S index 28e0d793281..0b4d1ab377d 100644 --- a/libgcc/config/arm/ieee754-sf.S +++ b/libgcc/config/arm/ieee754-sf.S @@ -428,7 +428,18 @@ ARM_FUNC_ALIAS aeabi_l2f floatdisf #endif /* L_addsubsf3 */ -#ifdef L_arm_muldivsf3 +#if defined(L_arm_mulsf3) || defined(L_arm_muldivsf3) + +@ Define multiplication as weak in _arm_mulsf3.o so that it can be overriden +@ by the global definition in _arm_muldivsf3.o. This allows a program only +@ using multiplication to take the weak definition which does not contain the +@ division code. Programs using only division or both division and +@ multiplication will pull _arm_muldivsf3.o from which both the multiplication +@ and division are taken thanks to the override. +#ifdef L_arm_mulsf3 +WEAK mulsf3 +WEAK aeabi_fmul +#endif ARM_FUNC_START mulsf3 ARM_FUNC_ALIAS aeabi_fmul mulsf3 @@ -613,6 +624,8 @@ LSYM(Lml_n): FUNC_END aeabi_fmul FUNC_END mulsf3 +#ifdef L_arm_muldivsf3 + ARM_FUNC_START divsf3 ARM_FUNC_ALIAS aeabi_fdiv divsf3 CFI_START_FUNCTION @@ -756,6 +769,7 @@ LSYM(Ldv_s): FUNC_END divsf3 #endif /* L_muldivsf3 */ +#endif /* L_arm_mulsf3 || L_arm_muldivsf3 */ #ifdef L_arm_cmpsf2 diff --git a/libgcc/config/arm/lib1funcs.S b/libgcc/config/arm/lib1funcs.S index ff06d504a4c..193fb251fdb 100644 --- a/libgcc/config/arm/lib1funcs.S +++ b/libgcc/config/arm/lib1funcs.S @@ -359,12 +359,8 @@ SYM (\name): #define THUMB_SYNTAX #endif -.macro FUNC_START name sp_section= - .ifc \sp_section, function_section - .section .text.__\name,"ax",%progbits - .else +.macro FUNC_START name .text - .endif .globl SYM (__\name) TYPE (__\name) .align 0 @@ -390,8 +386,8 @@ SYM (\name): #if defined(__thumb2__) /* For Thumb-2 we build everything in thumb mode. */ -.macro ARM_FUNC_START name sp_section= - FUNC_START \name \sp_section +.macro ARM_FUNC_START name + FUNC_START \name .syntax unified .endm #define EQUIV .thumb_set @@ -422,12 +418,8 @@ _L__\name: #ifdef NOT_ISA_TARGET_32BIT #define EQUIV .thumb_set #else -.macro ARM_FUNC_START name sp_section= - .ifc \sp_section, function_section - .section .text.__\name,"ax",%progbits - .else +.macro ARM_FUNC_START name .text - .endif .globl SYM (__\name) TYPE (__\name) .align 0 @@ -2169,7 +2161,8 @@ LSYM(Lchange_\register): .endm #ifndef __symbian__ -/* The condition here must match the one in gcc/config/arm/elf.h. */ +/* The condition here must match the one in gcc/config/arm/elf.h and + libgcc/config/arm/t-elf. */ #ifndef NOT_ISA_TARGET_32BIT #include "ieee754-df.S" #include "ieee754-sf.S" diff --git a/libgcc/config/arm/t-elf b/libgcc/config/arm/t-elf index 9e7a3170f17..9da6cd37054 100644 --- a/libgcc/config/arm/t-elf +++ b/libgcc/config/arm/t-elf @@ -1,3 +1,19 @@ +ifeq (,$(findstring __symbian__,$(shell $(gcc_compile_bare) -dM -E -