From: Hai Shan <haishan.bai@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Fixed Powerpc SPE data type conversion failure
Date: Sun, 14 Nov 2010 12:11:02 +0800 [thread overview]
Message-ID: <1289707863-1768-1-git-send-email-shan.hai@windriver.com> (raw)
The following test case failed on Powerpc e500 with CONFIG_SPE
static float fm;
static signed int si_min = (-2147483647 - 1);
static unsigned int ui;
int main()
{
fm = (float) si_min; ;
ui = (unsigned int)fm;
printf("ui=%d, should be %d\n", ui, si_min);
return 0;
}
Result: ui=-1, should be -2147483648
The reason is failure to emulate the minus float to unsigned conversion instruction
in the SPE driver.
---
arch/powerpc/math-emu/math_efp.c | 17 +++++++++++++----
1 files changed, 13 insertions(+), 4 deletions(-)
next reply other threads:[~2010-11-14 4:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-14 4:11 Hai Shan [this message]
2010-11-14 4:11 ` [PATCH] Fix float to unsigned conversion failure with SPE enabled Hai Shan
2010-11-16 11:29 ` Josh Boyer
2010-11-17 1:39 ` haishan
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