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...... 864B %vreg19<def,dead> = COPY %vreg50 880B %vreg19:lo16<def,read-undef> = COPY %vreg73 896B ... 912B mv_a32_r16_rmod1 %vreg19, %vreg20 ... *** Bad machine code: Multiple connected components in live interval *** - function: fixedconv - interval: %vreg19 [864r,864d:0)[880r,1024r:1) 0 at 864r 1 at 880r 0: valnos 0 1: valnos 1 So here, both the setting of the hi16 and lo16 parts are marked with read-undef, as wanted. However 864B %vreg19<def,dead> = COPY %vreg50 looks suspicious to me. It's like it thi...

Hi, I have a problem regarding sub-register definitions and LiveIntervals on our target. When a subregister is defined, other parts of the register are always left untouched - they are neither read or def:ed. It however seems that Codegen treats subregister definitions as somehow clobbering the whole register. The SSA-code looks like this after isel: (Reg0 and Reg1 are 16bit registers. Reg2,