I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
if (cond)
{
}
else
{
...
}
where REG is a pseudo register and r0 is a physical register. I have
On 03/25/2010 04:03 PM, Jie Zhang wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
if (cond)
{
}
else
{
...
}
On Thu, Mar 25, 2010 at 4:14 PM, Bernd Schmidt ber...@codesourcery.com wrote:
On 03/25/2010 04:03 PM, Jie Zhang wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG =
On 03/25/10 09:14, Bernd Schmidt wrote:
On 03/25/2010 04:03 PM, Jie Zhang wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
if (cond)
{
On Thu, Mar 25, 2010 at 4:03 PM, Jie Zhang j...@codesourcery.com wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
if (cond)
{
}
else
{
On 03/25/2010 11:22 PM, Jeff Law wrote:
On 03/25/10 09:14, Bernd Schmidt wrote:
On 03/25/2010 04:03 PM, Jie Zhang wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
if (cond)
{
}
On 03/25/2010 11:24 PM, Steven Bosscher wrote:
On Thu, Mar 25, 2010 at 4:03 PM, Jie Zhangj...@codesourcery.com wrote:
I just found that the current RTL code hoisting cannot optimize
REG = ...
if (cond)
{
r0 = REG;
}
else
{
r0 = REG;
...
}
to
REG = ...
r0 = REG;
On 03/25/10 10:19, Jie Zhang wrote:
On 03/25/2010 11:22 PM, Jeff Law wrote:
I never bothered to implement hoisting which touched hard regs -- I
never thought the cost/benefit analysis made much sense. It's quite a
bit more work to implement and code motion of hard regs is much more
restricted
