ARM/ARM64: Improve comments for kSaveEverything assembly.
Addresses post-submit comments for
https://android-review.googlesource.com/255290
Test: Rely on TreeHugger (just adds comments).
Bug: 30212852
Change-Id: I6ccc004774e18bbd83e3940e908cfc6c521142db
diff --git a/runtime/arch/arm64/quick_entrypoints_arm64.S b/runtime/arch/arm64/quick_entrypoints_arm64.S
index 4289cab..3e6fbaf 100644
--- a/runtime/arch/arm64/quick_entrypoints_arm64.S
+++ b/runtime/arch/arm64/quick_entrypoints_arm64.S
@@ -331,6 +331,7 @@
#endif
// Save FP registers.
+ // For better performance, store d0 and d31 separately, so that all STPs are 16-byte aligned.
str d0, [sp, #8]
stp d1, d2, [sp, #16]
stp d3, d4, [sp, #32]
@@ -431,6 +432,7 @@
.macro RESTORE_SAVE_EVERYTHING_FRAME
// Restore FP registers.
+ // For better performance, load d0 and d31 separately, so that all LDPs are 16-byte aligned.
ldr d0, [sp, #8]
ldp d1, d2, [sp, #16]
ldp d3, d4, [sp, #32]