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2010 May 11
0
[LLVMdev] How does SSEDomainFix work?
...SE execution domain pass does not change them because there are zero domain crossings, zero extra latency. Everything takes place in the float domain which is just as fast.
If you use operations that are only available in one domain, the SSE execution domain pass kicks in:
define <4 x i32> @intfoo(<4 x i32> %x, <4 x i32> %y, <4 x i32> %z)
nounwind readnone {
entry:
%0 = add <4 x i32> %x, %z
%not = xor <4 x i32> %z, <i32 -1, i32 -1, i32 -1, i32 -1>
%1 = and <4 x i32> %not, %y
%2 = xor <4 x i32> %0, %1
ret <4 x i32> %2
}
_intfoo:
mov...
2010 May 11
2
[LLVMdev] How does SSEDomainFix work?
Hello. This is my 1st post.
I have tried SSE execution domain fixup pass.
But I am not able to see any improvements.
I expect for the example below to use MOVDQA, PAND &c.
(On nehalem, ANDPS is extremely slower than PAND)
Please tell me if something would be wrong for me.
Thank you.
Takumi
Host: i386-mingw32
Build: trunk at 103373
foo.ll:
define <4 x i32> @foo(<4 x i32> %x,