Le programme:

        .file   "test.c"
        .text
.globl main
        .type   main, @function
main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ecx
        subl    $52, %esp
        movl    $0, %eax
        movl    $-1476395008, %edx
        movl    $16385, %ecx
        movl    %eax, -56(%ebp)
        movl    %edx, -52(%ebp)
        movl    %ecx, -48(%ebp)
        movl    $0, %eax
        movl    $-1073741824, %edx
        movl    $16383, %ecx
        movl    %eax, -40(%ebp)
        movl    %edx, -36(%ebp)
        movl    %ecx, -32(%ebp)
        fldt    -56(%ebp)
        fldt    -40(%ebp)
        fdivrp  %st, %st(1)
        fstpt   -24(%ebp)
        movl    $0, %eax
        addl    $52, %esp
        popl    %ecx
        popl    %ebp
        leal    -4(%ecx), %esp
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)"
        .section        .note.GNU-stack,"",@progbits


L'execution

Type "help info" followed by info subcommand name for full documentation.
Command name abbreviations are allowed if unambiguous.
(gdb) info float
  R7: Valid   0x4001a800000000000000 +5.25
=>R6: Valid   0x3fffc000000000000000 +1.5
  R5: Empty   0x00000000000000000000
  R4: Empty   0x00000000000000000000
  R3: Empty   0x00000000000000000000
  R2: Empty   0x00000000000000000000
  R1: Empty   0x00000000000000000000
  R0: Empty   0x00000000000000000000

Status Word:         0x3000
                       TOP: 6
Control Word:        0x037f   IM DM ZM OM UM PM
                       PC: Extended Precision (64-bits)
                       RC: Round to nearest
Tag Word:            0x0fff
Instruction Pointer: 0x73:0x08098264
Operand Pointer:     0x7b:0xbfaca170
Opcode:              0x0000
(gdb) n
28              fstpt   -24(%ebp)
(gdb) info float
=>R7: Valid   0x4000e000000000000000 +3.5
  R6: Empty   0x3fffc000000000000000
  R5: Empty   0x00000000000000000000
  R4: Empty   0x00000000000000000000
  R3: Empty   0x00000000000000000000
  R2: Empty   0x00000000000000000000
  R1: Empty   0x00000000000000000000
  R0: Empty   0x00000000000000000000

Status Word:         0x3800
                       TOP: 7
Control Word:        0x037f   IM DM ZM OM UM PM
                       PC: Extended Precision (64-bits)
                       RC: Round to nearest
Tag Word:            0x3fff
Instruction Pointer: 0x73:0x08098267
Operand Pointer:     0x7b:0xbfaca170
Opcode:              0x0000