From: Felix Fietkau <nbd@nbd.name>
Date: Thu, 4 Aug 2016 18:29:45 +0000 (+0200)
Subject: gcc: add a patch to generate better code with Os on mips
X-Git-Tag: v17.01.0-rc1~1789
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ecf7671b769fe96f7b5134be442089f8bdba55d2;p=openwrt%2Fstaging%2Fchunkeey.git

gcc: add a patch to generate better code with Os on mips

Also happens to reduce compressed code size a bit

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/toolchain/gcc/patches/5.4.0/300-mips_Os_cpu_rtx_cost_model.patch b/toolchain/gcc/patches/5.4.0/300-mips_Os_cpu_rtx_cost_model.patch
new file mode 100644
index 0000000000..1743658ac6
--- /dev/null
+++ b/toolchain/gcc/patches/5.4.0/300-mips_Os_cpu_rtx_cost_model.patch
@@ -0,0 +1,14 @@
+Use the proper rtx cost model for the selected CPU, even when optimizing
+for size. This generates better code.
+
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -17483,7 +17483,7 @@ mips_option_override (void)
+     flag_pcc_struct_return = 0;
+ 
+   /* Decide which rtx_costs structure to use.  */
+-  if (optimize_size)
++  if (0 && optimize_size)
+     mips_cost = &mips_rtx_cost_optimize_size;
+   else
+     mips_cost = &mips_rtx_cost_data[mips_tune];
diff --git a/toolchain/gcc/patches/6.1.0/300-mips_Os_cpu_rtx_cost_model.patch b/toolchain/gcc/patches/6.1.0/300-mips_Os_cpu_rtx_cost_model.patch
new file mode 100644
index 0000000000..d76bd8cb1d
--- /dev/null
+++ b/toolchain/gcc/patches/6.1.0/300-mips_Os_cpu_rtx_cost_model.patch
@@ -0,0 +1,11 @@
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -17928,7 +17928,7 @@ mips_option_override (void)
+     flag_pcc_struct_return = 0;
+ 
+   /* Decide which rtx_costs structure to use.  */
+-  if (optimize_size)
++  if (0 && optimize_size)
+     mips_cost = &mips_rtx_cost_optimize_size;
+   else
+     mips_cost = &mips_rtx_cost_data[mips_tune];