From: Richard Earnshaw Date: Fri, 29 Jul 2005 09:32:14 +0000 (+0000) Subject: re PR rtl-optimization/23117 (ICE on valid code while building libgcc) X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=abf86bf22730d89446f0013e9ce0fd6cddbc6e25;p=gcc.git re PR rtl-optimization/23117 (ICE on valid code while building libgcc) Richard Earnshaw Steven Bosscher PR rtl-optimization/23117 * sched-rgn.c (add_branch_dependences): Handle COND_EXEC correctly when head == tail. Tidy comment. Co-Authored-By: Steven Bosscher From-SVN: r102551 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 07e31b4bf42..212be1898bf 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2005-07-29 Richard Earnshaw + Steven Bosscher + + PR rtl-optimization/23117 + * sched-rgn.c (add_branch_dependences): Handle COND_EXEC correctly + when head == tail. Tidy comment. + 2005-07-28 Richard Henderson * cse.c (exp_equiv_p): Special case CONST_DOUBLE. diff --git a/gcc/sched-rgn.c b/gcc/sched-rgn.c index a4c19648200..ef182821412 100644 --- a/gcc/sched-rgn.c +++ b/gcc/sched-rgn.c @@ -1954,9 +1954,9 @@ add_branch_dependences (rtx head, rtx tail) T = [addr] C ? addr += 4 - !C ? X += 12 + !C ? X += 12 C ? T += 1 - C ? jump foo + C ? jump foo On a target with a one cycle stall on a memory access the optimal sequence would be: @@ -1977,17 +1977,17 @@ add_branch_dependences (rtx head, rtx tail) if (!reload_completed || ! JUMP_P (tail)) return; - insn = PREV_INSN (tail); + insn = tail; while (insn != head) { + insn = PREV_INSN (insn); + /* Note that we want to add this dependency even when sched_insns_conditions_mutex_p returns true. The whole point is that we _want_ this dependency, even if these insns really are independent. */ if (INSN_P (insn) && GET_CODE (PATTERN (insn)) == COND_EXEC) add_dependence (tail, insn, REG_DEP_ANTI); - - insn = PREV_INSN (insn); } #endif }