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| author | Daniel Hellstrom <daniel@gaisler.com> | 2014-05-28 10:29:37 +0200 |
|---|---|---|
| committer | Daniel Hellstrom <daniel@gaisler.com> | 2014-12-02 13:57:15 +0100 |
| commit | 6930aa7f19e4b3fd5ae6fc5178f650a706b0ffcd (patch) | |
| tree | bbc28f456d5c4267ebe81c898a70c63080aadae3 | |
| parent | SPARC: window overflow optimization (diff) | |
| download | rtems-6930aa7f19e4b3fd5ae6fc5178f650a706b0ffcd.tar.bz2 | |
SPARC: optimize window overflow trap entry
By using a optimized trap entry we can move instructions from
the window overflow function into the trap entry vector. By
using the saved locals instead of g1 we don't need to save
that register temporarily. Also spead out non store instructions
inbetween stores to use the write buffer better.
| -rw-r--r-- | c/src/lib/libcpu/sparc/reg_win/window.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/sparc/reg_win/window.S b/c/src/lib/libcpu/sparc/reg_win/window.S index 535dc83105..a7d6910219 100644 --- a/c/src/lib/libcpu/sparc/reg_win/window.S +++ b/c/src/lib/libcpu/sparc/reg_win/window.S @@ -60,6 +60,7 @@ SYM(window_overflow_trap_handler): srl %l3, 1, %l3 ! l3 = WIM >> 1 wr %l3, %l2, %wim ! WIM = (WIM >> 1) ^ ! (WIM << (Number Windows - 1)) + ! 3 instruction delay not needed here std %i0, [%sp + 0x20] ! save input register set std %i2, [%sp + 0x28] std %i4, [%sp + 0x30] |