diff options
| author | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2018-01-12 20:39:42 -0200 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2018-01-12 20:39:42 -0200 |
| commit | af1e6be4ba60067907ea9e19e0cd6897d194e9cf (patch) | |
| tree | 7b4980cf45cfc1f7fd95b143cbc4fd2b3929e5b4 /sysdeps | |
| parent | 98d13ce07a6aee9efb2ef2405a95c6bb8e01dca3 (diff) | |
| download | glibc-af1e6be4ba60067907ea9e19e0cd6897d194e9cf.tar.gz glibc-af1e6be4ba60067907ea9e19e0cd6897d194e9cf.tar.xz glibc-af1e6be4ba60067907ea9e19e0cd6897d194e9cf.zip | |
powerpc: Fix llround spurious inexact on 32-bit POWER4 [BZ #22697]
This issue is similar to BZ #19235, where spurious exceptions are created from adding 0.5 then converting to an integer. The solution is based on Joseph's fix for BZ #19235. [BZ #22697] * sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S (__llround): Do not add 0.5 to integer or out-of-range arguments.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S b/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S index d0b00ac383..5ad89a1486 100644 --- a/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S +++ b/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S @@ -71,6 +71,11 @@ ENTRY (__llround) fcmpu cr1,fp1,fp12 /* x is negative? x < 0.0 */ blt- cr6,.Lretzero /* 0.5 > x < -0.5 so just return 0. */ bge- cr7,.Lnobias /* 2^52 > x < -2^52 just convert with no bias. */ + /* Test whether an integer to avoid spurious "inexact". */ + fadd fp3,fp2,fp9 + fsub fp3,fp3,fp9 + fcmpu cr5,fp2,fp3 + beq cr5,.Lnobias fadd fp3,fp2,fp10 /* |x|+=0.5 bias to prepare to round. */ bge cr1,.Lconvert /* x is positive so don't negate x. */ fnabs fp3,fp3 /* -(|x|+=0.5) */ |