commit 715f43e1553330bc804cea2951be195473dc343d
author Chris Larsen <chris.larsen@imgtec.com> Mon Oct 23 11:00:32 2017 -0700
committer Chris Larsen <chris.larsen@imgtec.com> Mon Oct 23 11:00:32 2017 -0700
tree 55e143005efe10e8448c91eff6b88a635af2a3f6
parent 9e842d3e7d6102d964178e36e5d596ca91895147

MIPS32: Improve stack alignment, use sdc1/ldc1, where possible.

- Ensure that SP is a multiple of 16 at all times, and
- Use ldc1/sdc1 to load/store FPU registers from/to 8-byte-aligned
  locations wherever possible.

Use `export ART_MIPS32_CHECK_ALIGNMENT=true` when building Android
to enable the new runtime alignment checks.

Test: Boot & run tests on 32-bit version of QEMU, and CI-20.
Test: test/testrunner/testrunner.py --target --optimizing --32
Test: test-art-host-gtest
Test: test-art-target-gtest

Change-Id: Ia667004573f419fd006098fcfadf5834239cb485

compiler/optimizing/emit_swap_mips_test.cc

diff --git a/compiler/optimizing/emit_swap_mips_test.cc b/compiler/optimizing/emit_swap_mips_test.cc
index 36e932c..b63914f 100644
--- a/compiler/optimizing/emit_swap_mips_test.cc
+++ b/compiler/optimizing/emit_swap_mips_test.cc
@@ -238,14 +238,14 @@
       DataType::Type::kInt32,
       nullptr);
   const char* expected =
-      "addiu $sp, $sp, -4\n"
+      "addiu $sp, $sp, -16\n"
       "sw $v0, 0($sp)\n"
-      "lw $v0, 56($sp)\n"
-      "lw $t8, 52($sp)\n"
-      "sw $v0, 52($sp)\n"
-      "sw $t8, 56($sp)\n"
+      "lw $v0, 68($sp)\n"
+      "lw $t8, 64($sp)\n"
+      "sw $v0, 64($sp)\n"
+      "sw $t8, 68($sp)\n"
       "lw $v0, 0($sp)\n"
-      "addiu $sp, $sp, 4\n";
+      "addiu $sp, $sp, 16\n";
   DriverWrapper(moves_, expected, "TwoStackSlots");
 }
 
@@ -261,18 +261,18 @@
       DataType::Type::kInt64,
       nullptr);
   const char* expected =
-      "addiu $sp, $sp, -4\n"
+      "addiu $sp, $sp, -16\n"
       "sw $v0, 0($sp)\n"
-      "lw $v0, 60($sp)\n"
-      "lw $t8, 52($sp)\n"
-      "sw $v0, 52($sp)\n"
-      "sw $t8, 60($sp)\n"
-      "lw $v0, 64($sp)\n"
-      "lw $t8, 56($sp)\n"
-      "sw $v0, 56($sp)\n"
-      "sw $t8, 64($sp)\n"
+      "lw $v0, 72($sp)\n"
+      "lw $t8, 64($sp)\n"
+      "sw $v0, 64($sp)\n"
+      "sw $t8, 72($sp)\n"
+      "lw $v0, 76($sp)\n"
+      "lw $t8, 68($sp)\n"
+      "sw $v0, 68($sp)\n"
+      "sw $t8, 76($sp)\n"
       "lw $v0, 0($sp)\n"
-      "addiu $sp, $sp, 4\n";
+      "addiu $sp, $sp, 16\n";
   DriverWrapper(moves_, expected, "TwoDoubleStackSlots");
 }