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| author | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2012-07-31 15:30:38 +0000 |
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| committer | joseph <joseph@7b3dc134-2b1b-0410-93df-9e9f96275f8d> | 2012-07-31 15:30:38 +0000 |
| commit | dd3105b347f432016fcdc1abd472c3717f557c9e (patch) | |
| tree | cbaaecdaa1d3ad240177c9040f7f46c1387716ce /libc/sysdeps/i386/fpu/s_expm1f.S | |
| parent | 20f73aac36c2b2c240dcc379d5117488fe44960c (diff) | |
| download | eglibc2-dd3105b347f432016fcdc1abd472c3717f557c9e.tar.gz | |
Merge changes between r19464 and r19920 from /fsf/trunk.
git-svn-id: svn://svn.eglibc.org/trunk@19921 7b3dc134-2b1b-0410-93df-9e9f96275f8d
Diffstat (limited to 'libc/sysdeps/i386/fpu/s_expm1f.S')
| -rw-r--r-- | libc/sysdeps/i386/fpu/s_expm1f.S | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/libc/sysdeps/i386/fpu/s_expm1f.S b/libc/sysdeps/i386/fpu/s_expm1f.S index 45257d752..fc82b9234 100644 --- a/libc/sysdeps/i386/fpu/s_expm1f.S +++ b/libc/sysdeps/i386/fpu/s_expm1f.S @@ -51,19 +51,31 @@ ENTRY(__expm1f) jae HIDDEN_JUMPTARGET (__expf) flds 4(%esp) // x - fxam // Is NaN or +-Inf? + fxam // Is NaN, +-Inf or +-0? + xorb $0x80, %ah + cmpl $0xc190, %eax // is num <= -18.0? fstsw %ax movb $0x45, %ch + jb 4f + + // Below -18.0 (may be -NaN or -Inf). + andb %ah, %ch +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + cmpb $0x01, %ch + je 5f // If -NaN, jump. + jmp 2f // -large, possibly -Inf. + +4: // In range -18.0 to 88.5 (may be +-0 but not NaN or +-Inf). andb %ah, %ch cmpb $0x40, %ch je 3f // If +-0, jump. #ifdef PIC LOAD_PIC_REG (dx) #endif - cmpb $0x05, %ch - je 2f // If +-Inf, jump. - fldt MO(l2e) // log2(e) : x +5: fldt MO(l2e) // log2(e) : x fmulp // log2(e)*x fld %st // log2(e)*x : log2(e)*x frndint // int(log2(e)*x) : log2(e)*x @@ -79,9 +91,7 @@ ENTRY(__expm1f) fsubrp %st, %st(1) // 2^(log2(e)*x) ret -2: testl $0x200, %eax // Test sign. - jz 3f // If positive, jump. - fstp %st +2: fstp %st fldl MO(minus1) // Set result to -1.0. 3: ret END(__expm1f) |