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| [samth@huor:~/.../math-test/math/tests (master) plt] cat x.c | |
| /* pow example */ | |
| #include <stdio.h> /* printf */ | |
| #include <math.h> /* pow */ | |
| int main (int argc, char** argv) | |
| { | |
| double d = 1.4916681462400412e-154; | |
| double x = -1.0; | |
| if (argc > 5) { | |
| x = x+(double)argc; | |
| } | |
| printf ("test = %20.20g\n", pow (d, x) ); | |
| printf ("test = %20.20g\n", pow (d, -1.0) ); | |
| return 0; | |
| } | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc x.c -S -masm=intel -m32 -o x32.s | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc x.c -S -masm=intel -m64 -o x64.s | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gist x.c x32.s x64.s | |
| https://gist.github.com/8b8659c0cdcca6b9e9b3ee640fc282eb | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc x.c -masm=intel -m64 -o x64 | |
| /bin/ld: /tmp/ccWrf1uh.o: in function `main': | |
| x.c:(.text+0x59): undefined reference to `pow' | |
| collect2: error: ld returned 1 exit status | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc x.c -masm=intel -m64 -o x64 -lm | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc x.c -masm=intel -m32 -o x32 -lm | |
| [samth@huor:~/.../math-test/math/tests (master) plt] ./x64 | |
| test = 6.7039039649712985498e+153 | |
| test = 6.7039039649713000384e+153 | |
| [samth@huor:~/.../math-test/math/tests (master) plt] ./x32 | |
| test = 6.7039039649712985498e+153 | |
| test = 6.7039039649712985498e+153 | |
| [samth@huor:~/.../math-test/math/tests (master) plt] | |
| [samth@huor:~/.../math-test/math/tests (master) plt] uname -a | |
| Linux huor 5.3.0-29-generic #31-Ubuntu SMP Fri Jan 17 17:27:26 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux | |
| [samth@huor:~/.../math-test/math/tests (master) plt] gcc -v | |
| Using built-in specs. | |
| COLLECT_GCC=gcc | |
| COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper | |
| OFFLOAD_TARGET_NAMES=nvptx-none:hsa | |
| OFFLOAD_TARGET_DEFAULT=1 | |
| Target: x86_64-linux-gnu | |
| Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu | |
| Thread model: posix | |
| gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2) |
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| /* pow example */ | |
| #include <stdio.h> /* printf */ | |
| #include <math.h> /* pow */ | |
| int main (int argc, char** argv) | |
| { | |
| double d = 1.4916681462400412e-154; | |
| double x = -1.0; | |
| if (argc > 5) { | |
| x = x+(double)argc; | |
| } | |
| printf ("test = %20.20g\n", pow (d, x) ); | |
| printf ("test = %20.20g\n", pow (d, -1.0) ); | |
| return 0; | |
| } | |
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| .file "x.c" | |
| .intel_syntax noprefix | |
| .text | |
| .section .rodata | |
| .LC2: | |
| .string "test = %20.20g\n" | |
| .text | |
| .globl main | |
| .type main, @function | |
| main: | |
| .LFB0: | |
| .cfi_startproc | |
| endbr32 | |
| lea ecx, 4[esp] | |
| .cfi_def_cfa 1, 0 | |
| and esp, -16 | |
| push DWORD PTR -4[ecx] | |
| push ebp | |
| .cfi_escape 0x10,0x5,0x2,0x75,0 | |
| mov ebp, esp | |
| push ebx | |
| push ecx | |
| .cfi_escape 0xf,0x3,0x75,0x78,0x6 | |
| .cfi_escape 0x10,0x3,0x2,0x75,0x7c | |
| sub esp, 16 | |
| call __x86.get_pc_thunk.bx | |
| add ebx, OFFSET FLAT:_GLOBAL_OFFSET_TABLE_ | |
| mov eax, ecx | |
| fld QWORD PTR .LC0@GOTOFF[ebx] | |
| fstp QWORD PTR -16[ebp] | |
| fld1 | |
| fchs | |
| fstp QWORD PTR -24[ebp] | |
| cmp DWORD PTR [eax], 5 | |
| jle .L2 | |
| fild DWORD PTR [eax] | |
| fld QWORD PTR -24[ebp] | |
| faddp st(1), st | |
| fstp QWORD PTR -24[ebp] | |
| .L2: | |
| push DWORD PTR -20[ebp] | |
| push DWORD PTR -24[ebp] | |
| push DWORD PTR -12[ebp] | |
| push DWORD PTR -16[ebp] | |
| call pow@PLT | |
| add esp, 16 | |
| sub esp, 4 | |
| lea esp, -8[esp] | |
| fstp QWORD PTR [esp] | |
| lea eax, .LC2@GOTOFF[ebx] | |
| push eax | |
| call printf@PLT | |
| add esp, 16 | |
| fld1 | |
| fdiv QWORD PTR -16[ebp] | |
| sub esp, 4 | |
| lea esp, -8[esp] | |
| fstp QWORD PTR [esp] | |
| lea eax, .LC2@GOTOFF[ebx] | |
| push eax | |
| call printf@PLT | |
| add esp, 16 | |
| mov eax, 0 | |
| lea esp, -8[ebp] | |
| pop ecx | |
| .cfi_restore 1 | |
| .cfi_def_cfa 1, 0 | |
| pop ebx | |
| .cfi_restore 3 | |
| pop ebp | |
| .cfi_restore 5 | |
| lea esp, -4[ecx] | |
| .cfi_def_cfa 4, 4 | |
| ret | |
| .cfi_endproc | |
| .LFE0: | |
| .size main, .-main | |
| .section .rodata | |
| .align 8 | |
| .LC0: | |
| .long 4294967295 | |
| .long 536870911 | |
| .section .text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat | |
| .globl __x86.get_pc_thunk.bx | |
| .hidden __x86.get_pc_thunk.bx | |
| .type __x86.get_pc_thunk.bx, @function | |
| __x86.get_pc_thunk.bx: | |
| .LFB1: | |
| .cfi_startproc | |
| mov ebx, DWORD PTR [esp] | |
| ret | |
| .cfi_endproc | |
| .LFE1: | |
| .ident "GCC: (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008" | |
| .section .note.GNU-stack,"",@progbits | |
| .section .note.gnu.property,"a" | |
| .align 4 | |
| .long 1f - 0f | |
| .long 4f - 1f | |
| .long 5 | |
| 0: | |
| .string "GNU" | |
| 1: | |
| .align 4 | |
| .long 0xc0000002 | |
| .long 3f - 2f | |
| 2: | |
| .long 0x3 | |
| 3: | |
| .align 4 | |
| 4: |
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| .file "x.c" | |
| .intel_syntax noprefix | |
| .text | |
| .section .rodata | |
| .LC2: | |
| .string "test = %20.20g\n" | |
| .text | |
| .globl main | |
| .type main, @function | |
| main: | |
| .LFB0: | |
| .cfi_startproc | |
| endbr64 | |
| push rbp | |
| .cfi_def_cfa_offset 16 | |
| .cfi_offset 6, -16 | |
| mov rbp, rsp | |
| .cfi_def_cfa_register 6 | |
| sub rsp, 32 | |
| mov DWORD PTR -20[rbp], edi | |
| mov QWORD PTR -32[rbp], rsi | |
| movsd xmm0, QWORD PTR .LC0[rip] | |
| movsd QWORD PTR -8[rbp], xmm0 | |
| movsd xmm0, QWORD PTR .LC1[rip] | |
| movsd QWORD PTR -16[rbp], xmm0 | |
| cmp DWORD PTR -20[rbp], 5 | |
| jle .L2 | |
| cvtsi2sd xmm0, DWORD PTR -20[rbp] | |
| movsd xmm1, QWORD PTR -16[rbp] | |
| addsd xmm0, xmm1 | |
| movsd QWORD PTR -16[rbp], xmm0 | |
| .L2: | |
| movsd xmm0, QWORD PTR -16[rbp] | |
| mov rax, QWORD PTR -8[rbp] | |
| movapd xmm1, xmm0 | |
| movq xmm0, rax | |
| call pow@PLT | |
| lea rdi, .LC2[rip] | |
| mov eax, 1 | |
| call printf@PLT | |
| movsd xmm0, QWORD PTR .LC3[rip] | |
| divsd xmm0, QWORD PTR -8[rbp] | |
| lea rdi, .LC2[rip] | |
| mov eax, 1 | |
| call printf@PLT | |
| mov eax, 0 | |
| leave | |
| .cfi_def_cfa 7, 8 | |
| ret | |
| .cfi_endproc | |
| .LFE0: | |
| .size main, .-main | |
| .section .rodata | |
| .align 8 | |
| .LC0: | |
| .long 4294967295 | |
| .long 536870911 | |
| .align 8 | |
| .LC1: | |
| .long 0 | |
| .long -1074790400 | |
| .align 8 | |
| .LC3: | |
| .long 0 | |
| .long 1072693248 | |
| .ident "GCC: (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008" | |
| .section .note.GNU-stack,"",@progbits | |
| .section .note.gnu.property,"a" | |
| .align 8 | |
| .long 1f - 0f | |
| .long 4f - 1f | |
| .long 5 | |
| 0: | |
| .string "GNU" | |
| 1: | |
| .align 8 | |
| .long 0xc0000002 | |
| .long 3f - 2f | |
| 2: | |
| .long 0x3 | |
| 3: | |
| .align 8 | |
| 4: |
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