search for: adrpadd

...gt; > the GlobalMerge pass? > > It could, and does, from what I've seen (beware anecdata): > - reusing the adrp base prevents optimizing it (the various > Adrp*{ldr,str} LOHs). > - reusing the adrp+add MergedGlobal pointer, with indexed addressing, > doesn't prevent the AdrpAdd optimization. > > All in all, whether GlobalMerge is profitable or not (by increasing > register pressure, or adding another indirection), whenever the LOH > optimizations fire, they reduce its usefulness. > > AFAICT, the only case where LOHs help GlobalMerge is when the > Merg...

...pass? >> >> It could, and does, from what I've seen (beware anecdata): >> - reusing the adrp base prevents optimizing it (the various >> Adrp*{ldr,str} LOHs). >> - reusing the adrp+add MergedGlobal pointer, with indexed addressing, >> doesn't prevent the AdrpAdd optimization. >> >> All in all, whether GlobalMerge is profitable or not (by increasing >> register pressure, or adding another indirection), whenever the LOH >> optimizations fire, they reduce its usefulness. >> >> AFAICT, the only case where LOHs help GlobalMer...

...ould affect the profitability of > the GlobalMerge pass? It could, and does, from what I've seen (beware anecdata): - reusing the adrp base prevents optimizing it (the various Adrp*{ldr,str} LOHs). - reusing the adrp+add MergedGlobal pointer, with indexed addressing, doesn't prevent the AdrpAdd optimization. All in all, whether GlobalMerge is profitable or not (by increasing register pressure, or adding another indirection), whenever the LOH optimizations fire, they reduce its usefulness. AFAICT, the only case where LOHs help GlobalMerge is when the MergedGlobal base is closer to the ad...

Hi Ahmed, Did you run these experiments on a platform with a linker that makes use of the AArch64CollectLOH-pass-produced information? I'm guessing that the AArch64CollectLOH-pass information and a linker that makes use of that information could affect the profitability of the GlobalMerge pass? Thanks, Kristof > -----Original Message----- > From: llvmdev-bounces at cs.uiuc.edu

...> It could, and does, from what I've seen (beware anecdata): > >> - reusing the adrp base prevents optimizing it (the various > >> Adrp*{ldr,str} LOHs). > >> - reusing the adrp+add MergedGlobal pointer, with indexed addressing, > >> doesn't prevent the AdrpAdd optimization. > >> > >> All in all, whether GlobalMerge is profitable or not (by increasing > >> register pressure, or adding another indirection), whenever the LOH > >> optimizations fire, they reduce its usefulness. > >> > >> AFAICT, the only...