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| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-04-06 14:50:11 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-04-06 14:58:05 -0500 |
| commit | 8bd70862e11023e7f827f240a5a214f847ae982d (patch) | |
| tree | c7ed6614a24d974afaf8b416da0fc373052a5911 /sysdeps/powerpc/powerpc32 | |
| parent | d42f3448a7af9c55f2193450964772c7c2a0d29b (diff) | |
| download | glibc-8bd70862e11023e7f827f240a5a214f847ae982d.tar.gz glibc-8bd70862e11023e7f827f240a5a214f847ae982d.tar.xz glibc-8bd70862e11023e7f827f240a5a214f847ae982d.zip | |
PowerPC: Fix nearbyint/nearbyintf result for FE_DOWNWARD
This patch fixes the powerpc32 optimized nearbyint/nearbyintf bogus results for FE_DOWNWARD rounding mode. This is due wrong instructions sequence used in the rounding calculation (two subtractions instead of adition and a subtraction). Fixes BZ#16815.
Diffstat (limited to 'sysdeps/powerpc/powerpc32')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S | 10 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S | 11 |
2 files changed, 11 insertions, 10 deletions
diff --git a/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S b/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S index 2734738d4d..05ab40ecb5 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S @@ -53,17 +53,17 @@ ENTRY (__nearbyint) fcmpu cr7,fp1,fp12 /* if (x > 0.0 */ ble cr7,L(lessthanzero) mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ - fadd fp0,fp1,fp13 /* x += TWO52 */ - fsub fp1,fp0,fp13 /* x -= TWO52 */ + fadd fp1,fp1,fp13 /* x += TWO52 */ + fsub fp1,fp1,fp13 /* x -= TWO52 */ fabs fp1,fp1 /* if (x == 0.0 */ mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ blr L(lessthanzero): bgelr cr7 mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ - fsub fp0,fp13,fp1 /* x -= TWO52 */ - fsub fp0,fp0,fp13 /* x += TWO52 */ - fneg fp1,fp0 /* if (x == 0.0) */ + fsub fp1,fp1,fp13 /* x -= TWO52 */ + fadd fp1,fp1,fp13 /* x += TWO52 */ + fnabs fp1,fp1 /* if (x == 0.0) */ mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ blr END (__nearbyint) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S b/sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S index 11bdc77370..7449a5f9b7 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S @@ -52,16 +52,17 @@ ENTRY (__nearbyintf) fcmpu cr7,fp1,fp12 /* if (x > 0.0 */ ble cr7,L(lessthanzero) mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ - fadds fp0,fp1,fp13 /* x += TWO23 */ - fsubs fp1,fp0,fp13 /* x -= TWO23 */ + fadds fp1,fp1,fp13 /* x += TWO23 */ + fsubs fp1,fp1,fp13 /* x -= TWO23 */ + fabs fp1,fp1 /* if (x == 0.0) */ mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ blr L(lessthanzero): bgelr cr7 mtfsb0 4*cr7+lt /* Disable FE_INEXACT exception */ - fsubs fp0,fp13,fp1 /* x -= TWO23 */ - fsubs fp0,fp0,fp13 /* x += TWO23 */ - fneg fp1,fp0 /* if (x == 0.0) */ + fsubs fp1,fp1,fp13 /* x -= TWO23 */ + fadds fp1,fp1,fp13 /* x += TWO23 */ + fnabs fp1,fp1 /* if (x == 0.0) */ mtfsb0 4*cr1+eq /* Clear any FE_INEXACT exception */ blr END (__nearbyintf) |