diff options
Diffstat (limited to 'contrib/gcc/reg-stack.c')
| -rw-r--r-- | contrib/gcc/reg-stack.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/contrib/gcc/reg-stack.c b/contrib/gcc/reg-stack.c index 9a6c89b..0f284ac 100644 --- a/contrib/gcc/reg-stack.c +++ b/contrib/gcc/reg-stack.c @@ -1060,10 +1060,21 @@ move_for_stack_reg (rtx insn, stack regstack, rtx pat) if (regstack->reg[i] == REGNO (src)) break; - /* The source must be live, and the dest must be dead. */ - if (i < 0 || get_hard_regnum (regstack, dest) >= FIRST_STACK_REG) + /* The destination must be dead, or life analysis is borked. */ + if (get_hard_regnum (regstack, dest) >= FIRST_STACK_REG) abort (); + /* If the source is not live, this is yet another case of + uninitialized variables. Load up a NaN instead. */ + if (i < 0) + { + PATTERN (insn) = pat + = gen_rtx_SET (VOIDmode, + FP_MODE_REG (REGNO (dest), SFmode), nan); + INSN_CODE (insn) = -1; + return move_for_stack_reg (insn, regstack, pat); + } + /* It is possible that the dest is unused after this insn. If so, just pop the src. */ |
