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| author | Ulrich Drepper <drepper@redhat.com> | 2000-12-03 10:00:46 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2000-12-03 10:00:46 +0000 |
| commit | 79569444efc685121f65d91f5b4eee834830d416 (patch) | |
| tree | 05e776a4edd548651a6eca18eef62983c5ca7475 /sysdeps/i386/fpu | |
| parent | 06f55c0c1d28a6ef1462c54a94988112070a0c50 (diff) | |
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Update.
2000-12-03 Ulrich Drepper <drepper@redhat.com>
* math/test-misc.c (main): Add tests for frexp.
Reported by Fred J. Tydeman <tydeman@tybor.com>.
* sysdeps/i386/fpu/s_frexpl.S: Don't overflow during the computation.
Diffstat (limited to 'sysdeps/i386/fpu')
| -rw-r--r-- | sysdeps/i386/fpu/s_frexpl.S | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_frexpl.S b/sysdeps/i386/fpu/s_frexpl.S index cb943f74c2..2645d220ee 100644 --- a/sysdeps/i386/fpu/s_frexpl.S +++ b/sysdeps/i386/fpu/s_frexpl.S @@ -32,6 +32,12 @@ ASM_TYPE_DIRECTIVE(two64,@object) two64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43 ASM_SIZE_DIRECTIVE(two64) + /* The following is LDBL_MAX / ldexp (1.0, 64), the largest + number we can handle the normal way. */ + ASM_TYPE_DIRECTIVE(largest,@object) +largest: + .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbe, 0x7f, 0, 0 + ASM_SIZE_DIRECTIVE(largest) #ifdef PIC #define MO(op) op##@GOTOFF(%edx) @@ -63,12 +69,16 @@ ENTRY (BP_SYM (__frexpl)) cmpl $0, %eax je 2f + cmpl $0x7fbe, %eax + ja 4f + fldt VAL0(%esp) #ifdef PIC call 3f 3: popl %edx addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %edx #endif + fmull MO(two64) /* It's not necessary to use a 80bit factor */ movl $-64, %ecx fstpt VAL0(%esp) @@ -92,5 +102,15 @@ ENTRY (BP_SYM (__frexpl)) LEAVE ret + +4: movl VAL2(%esp), %ecx + movl %ecx, %edx + andl $0x7fff, %ecx + + andl $0x8000, %edx + subl $16382, %ecx + orl $0x3ffe, %edx + movl %edx, VAL2(%esp) + jmp 1b END (BP_SYM (__frexpl)) weak_alias (BP_SYM (__frexpl), BP_SYM (frexpl)) |