GCC modified for the FreeChainXenon project
863d6524f3
My apologies for the inconvenience. My recent patch to preserve SUBREG_PROMOTED_VAR_P on (extend:HI (subreg/s:QI (reg:SI))), and other places in the middle-end, has broken the build on several targets. The change to convert_modes inadvertently used the same subreg_promoted_mode idiom for retrieving the mode of a SUBREG_REG as the existing code just a few lines earlier. Alas in the meantime, the original SUBREG gets replaced by one without SUBREG_PROMOTED_VAR_P, the whole raison-d'etre for my patch, and I'd not realized/noticed that subreg_promoted_mode asserts for this. Alas neither the bootstrap and regression test on x86_64-pc-linux-gnu nor my testing on nvptx-none must have hit this particular case. The logic of this transformation is sound, it's the implementation that's bitten me. This patch has been committed, after another "make bootstrap" on x86_64-pc-linux-gnu (just in case), and confirmation/pre-approval from Jeff Law that this indeed fixes the build failures seen on several platforms. My humble apologies again. 2021-08-31 Roger Sayle <roger@nextmovesoftware.com> gcc/ChangeLog * expr.c (convert_modes): Don't use subreg_promoted_mode on a SUBREG if it can't be guaranteed to a SUBREG_PROMOTED_VAR_P set. Instead use the standard (safer) is_a <scalar_int_mode> idiom. |
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