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Thanks. This is making a lot more sense now and it's looking like this issue isn't Mips specific. Here's the IR dump before simple register coalescing (note: I've patched the IR printer to print the contents of the regmask): 4480B %vreg260<def> = LDC1 %vreg253, <cp#3>[TF=6]; mem:LD8[ConstantPool] AFGR64:%vreg260 GPR32:%vreg253 4496B %vreg261<def> = FMUL_D32

To reduce memory consumption clobbered registers are handled with RegisterMask machine operands which contain a bitset of all registers clobbered. - Matthias > On Jul 29, 2015, at 3:00 PM, Daniel Sanders <daniel.sanders at imgtec.com> wrote: > > I believe I've identified the problem with almabench but I haven't found the root cause in the compiler yet. > > The