From: Richard Sandiford Date: Sun, 7 Jul 2019 09:49:14 +0000 (+0000) Subject: Fix uninitialised use in mips_split_move X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f40ce450f3c4b1cfd0a7e9c68e0c2a60d04b2a03;p=gcc.git Fix uninitialised use in mips_split_move While testing the fix for PR91068, I hit an rtl checking failure while building newlib. mips_split_move was decomposing an address that happened to be symbolic and then tried to access the REGNO of the base register field, which wasn't initialised but which by chance pointed to valid memory. 2019-07-07 Richard Sandiford gcc/ * config/mips/mips.c (mips_split_move): Zero-initialize addr and check whether addr.reg is nonnull before using it. From-SVN: r273174 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index edb8df5e15d..13622c8abbe 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2019-07-07 Richard Sandiford + + * config/mips/mips.c (mips_split_move): Zero-initialize addr + and check whether addr.reg is nonnull before using it. + 2019-07-06 Jakub Jelinek * omp-low.c (lower_rec_input_clauses): For lastprivate clauses in diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c index cbebb455fd5..e0535b18b7f 100644 --- a/gcc/config/mips/mips.c +++ b/gcc/config/mips/mips.c @@ -4849,7 +4849,7 @@ mips_split_move (rtx dest, rtx src, enum mips_split_type split_type, rtx insn_) can forward SRC for DEST. This is most useful if the next insn is a simple store. */ rtx_insn *insn = (rtx_insn *)insn_; - struct mips_address_info addr; + struct mips_address_info addr = {}; if (insn) { rtx_insn *next = next_nonnote_nondebug_insn_bb (insn); @@ -4862,7 +4862,7 @@ mips_split_move (rtx dest, rtx src, enum mips_split_type split_type, rtx insn_) { rtx tmp = XEXP (src, 0); mips_classify_address (&addr, tmp, GET_MODE (tmp), true); - if (REGNO (addr.reg) != REGNO (dest)) + if (addr.reg && REGNO (addr.reg) != REGNO (dest)) validate_change (next, &SET_SRC (set), src, false); } else