From 5fea81869314bd3283beec1e2f05865c331c3cda Mon Sep 17 00:00:00 2001 From: Tom de Vries Date: Fri, 20 Jun 2014 08:01:52 +0000 Subject: [PATCH] Don't save function_used_regs if it contains all call_used_regs 2014-06-20 Tom de Vries * final.c (collect_fn_hard_reg_usage): Don't save function_used_regs if it contains all call_used_regs. From-SVN: r211840 --- gcc/ChangeLog | 5 +++++ gcc/final.c | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e83b0ce18f35..108bc5f5b8a6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2014-06-20 Tom de Vries + + * final.c (collect_fn_hard_reg_usage): Don't save function_used_regs if + it contains all call_used_regs. + 2014-06-20 Tom de Vries * final.c (collect_fn_hard_reg_usage): Add and use variable diff --git a/gcc/final.c b/gcc/final.c index e39930d4207f..e67e84b8a2e8 100644 --- a/gcc/final.c +++ b/gcc/final.c @@ -4795,6 +4795,11 @@ collect_fn_hard_reg_usage (void) SET_HARD_REG_BIT (function_used_regs, i); #endif + /* The information we have gathered is only interesting if it exposes a + register from the call_used_regs that is not used in this function. */ + if (hard_reg_set_subset_p (call_used_reg_set, function_used_regs)) + return; + node = cgraph_rtl_info (current_function_decl); gcc_assert (node != NULL); -- 2.47.3