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powerpc: Fix llround spurious inexact on 32-bit POWER4 [BZ #22697]

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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.
This commit is contained in:
Tulio Magno Quites Machado Filho 2018-01-12 20:39:42 -02:00
parent 98d13ce07a
commit af1e6be4ba
2 changed files with 11 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2018-01-12 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
[BZ #22697]
* sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S (__llround):
Do not add 0.5 to integer or out-of-range arguments.
2018-01-12 Dmitry V. Levin <ldv@altlinux.org>
* po/bg.po: Update translations.

5
sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S
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@ -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) */