* [Qemu-devel] [PULL 0/1] softfloat: Don't execute divdeu without power7
@ 2018-11-04 10:08 Richard Henderson
2018-11-04 10:08 ` [Qemu-devel] [PULL 1/1] " Richard Henderson
2018-11-05 11:13 ` [Qemu-devel] [PULL 0/1] " Peter Maydell
0 siblings, 2 replies; 3+ messages in thread
From: Richard Henderson @ 2018-11-04 10:08 UTC (permalink / raw)
To: qemu-devel; +Cc: peter.maydell
The following changes since commit 7d56239f159afc2e7bd42623947e56ba48f37836:
Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20181102' into staging (2018-11-02 17:17:12 +0000)
are available in the Git repository at:
https://github.com/rth7680/qemu.git tags/pull-softfloat-20181104
for you to fetch changes up to 7370981bd1ef58b3c20ba8b83cc342d1c61bc773:
softfloat: Don't execute divdeu without power7 (2018-11-04 10:04:40 +0000)
----------------------------------------------------------------
Only use divdeu insn with Power7 and later.
----------------------------------------------------------------
Richard Henderson (1):
softfloat: Don't execute divdeu without power7
include/fpu/softfloat-macros.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] [PULL 1/1] softfloat: Don't execute divdeu without power7
2018-11-04 10:08 [Qemu-devel] [PULL 0/1] softfloat: Don't execute divdeu without power7 Richard Henderson
@ 2018-11-04 10:08 ` Richard Henderson
2018-11-05 11:13 ` [Qemu-devel] [PULL 0/1] " Peter Maydell
1 sibling, 0 replies; 3+ messages in thread
From: Richard Henderson @ 2018-11-04 10:08 UTC (permalink / raw)
To: qemu-devel; +Cc: peter.maydell
The divdeu instruction was added to ISA 2.06 (Power7).
Exclude this block from older cpus.
Fixes: 27ae5109a2ba (softfloat: Specialize udiv_qrnnd for ppc64)
Reported-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/fpu/softfloat-macros.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h
index c86687fa5e..b1d772e6d4 100644
--- a/include/fpu/softfloat-macros.h
+++ b/include/fpu/softfloat-macros.h
@@ -647,8 +647,8 @@ static inline uint64_t udiv_qrnnd(uint64_t *r, uint64_t n1,
asm("dlgr %0, %1" : "+r"(n) : "r"(d));
*r = n >> 64;
return n;
-#elif defined(_ARCH_PPC64)
- /* From Power ISA 3.0B, programming note for divdeu. */
+#elif defined(_ARCH_PPC64) && defined(_ARCH_PWR7)
+ /* From Power ISA 2.06, programming note for divdeu. */
uint64_t q1, q2, Q, r1, r2, R;
asm("divdeu %0,%2,%4; divdu %1,%3,%4"
: "=&r"(q1), "=r"(q2)
--
2.17.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PULL 0/1] softfloat: Don't execute divdeu without power7
2018-11-04 10:08 [Qemu-devel] [PULL 0/1] softfloat: Don't execute divdeu without power7 Richard Henderson
2018-11-04 10:08 ` [Qemu-devel] [PULL 1/1] " Richard Henderson
@ 2018-11-05 11:13 ` Peter Maydell
1 sibling, 0 replies; 3+ messages in thread
From: Peter Maydell @ 2018-11-05 11:13 UTC (permalink / raw)
To: Richard Henderson; +Cc: QEMU Developers
On 4 November 2018 at 10:08, Richard Henderson
<richard.henderson@linaro.org> wrote:
> The following changes since commit 7d56239f159afc2e7bd42623947e56ba48f37836:
>
> Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20181102' into staging (2018-11-02 17:17:12 +0000)
>
> are available in the Git repository at:
>
> https://github.com/rth7680/qemu.git tags/pull-softfloat-20181104
>
> for you to fetch changes up to 7370981bd1ef58b3c20ba8b83cc342d1c61bc773:
>
> softfloat: Don't execute divdeu without power7 (2018-11-04 10:04:40 +0000)
>
> ----------------------------------------------------------------
> Only use divdeu insn with Power7 and later.
>
> ----------------------------------------------------------------
> Richard Henderson (1):
> softfloat: Don't execute divdeu without power7
Applied, thanks.
-- PMM
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-11-04 10:08 [Qemu-devel] [PULL 0/1] softfloat: Don't execute divdeu without power7 Richard Henderson
2018-11-04 10:08 ` [Qemu-devel] [PULL 1/1] " Richard Henderson
2018-11-05 11:13 ` [Qemu-devel] [PULL 0/1] " Peter Maydell
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