On 25/07/17 16:12, Sebastian Huber wrote:
On 25/07/17 15:42, Eric Botcazou wrote:
What is your opinion with respect to a -mno-fsmuld option or something
similar?
Far better in my opinion (at least for LEON3).
How should I add this option? For example:
diff --git a/gcc/config/sparc/sparc.opt b/gcc/config/sparc/sparc.opt
index ae63d2018e3..7a582f3a870 100644
--- a/gcc/config/sparc/sparc.opt
+++ b/gcc/config/sparc/sparc.opt
@@ -93,6 +93,10 @@ mfmaf
Target Report Mask(FMAF)
Use UltraSPARC Fused Multiply-Add extensions.
+mfsmuld
+Target Report Mask(FSMULD)
+Use V8+ Floating-point Multiply Single to Double (FsMULd) instruction.
+
mpopc
Target Report Mask(POPC)
Use UltraSPARC Population-Count instruction.
In this case I have to update the cpu_table. I guess all (MASK_V8 ||
MASK_V9) && MASK_FPU entries should then get a MASK_FSMULD in the
enable field (except leon)?
The only CPUs in this category are hypersparc and leon3. What about all
the V9 processors? They don't have MASK_FPU set?
--
Sebastian Huber, embedded brains GmbH
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