search for: vcmpgt

Hi all, llvm newbie here. I'm trying to branch based on a vector compare. I've found a slow way (below) which goes through memory. Is there some idiom I'm missing so that it would use for instance movmsk for SSE or vcmpgt & cr6 for altivec? Or do I need to resort to calling the intrinsic directly? Thanks, Stephen. %16 = fcmp ogt <4 x float> %15, %cr %17 = extractelement <4 x i1> %16, i32 0 %18 = extractelement <4 x i1> %16, i32 1 %19 = extractelement <4 x i1> %16, i32 2 %20...

Hi Stephen, > Hi all, llvm newbie here. welcome! > I'm trying to branch based on a vector compare. I've found a slow way (below) > which goes through memory. Is there some idiom I'm missing so that it would use > for instance movmsk for SSE or vcmpgt & cr6 for altivec? I don't think you are missing anything: LLVM IR has no support for horizontal operations like or'ing the elements of a vector of boolean together. The code generators do try to recognize a few idioms and synthesize horizontal operations from them, but I think only a...

> > which goes through memory. Is there some idiom I'm missing so that it would use > > for instance movmsk for SSE or vcmpgt & cr6 for altivec? > > I don't think you are missing anything: LLVM IR has no support for horizontal > operations like or'ing the elements of a vector of boolean together. The code > generators do try to recognize a few idioms and synthesize horizontal > operations from...

Am 04.09.2012 00:08, schrieb Stephen: >>> which goes through memory. Is there some idiom I'm missing so that it would > use >>> for instance movmsk for SSE or vcmpgt & cr6 for altivec? >> >> I don't think you are missing anything: LLVM IR has no support for horizontal >> operations like or'ing the elements of a vector of boolean together. The code >> generators do try to recognize a few idioms and synthesize horizontal >&...