diff options
Diffstat (limited to 'gcc/cfgexpand.c')
| -rw-r--r-- | gcc/cfgexpand.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 8fa392f..21bdcda 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -6185,6 +6185,23 @@ stack_protect_prologue (void) rtx x, y; x = expand_normal (crtl->stack_protect_guard); + + if (targetm.have_stack_protect_combined_set () && guard_decl) + { + gcc_assert (DECL_P (guard_decl)); + y = DECL_RTL (guard_decl); + + /* Allow the target to compute address of Y and copy it to X without + leaking Y into a register. This combined address + copy pattern + allows the target to prevent spilling of any intermediate results by + splitting it after register allocator. */ + if (rtx_insn *insn = targetm.gen_stack_protect_combined_set (x, y)) + { + emit_insn (insn); + return; + } + } + if (guard_decl) y = expand_normal (guard_decl); else |