diff options
| author | steven <steven@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-06-30 09:32:41 +0000 |
|---|---|---|
| committer | steven <steven@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-06-30 09:32:41 +0000 |
| commit | 2b5620c634bd54a6bd37007b78334d46ba312ff1 (patch) | |
| tree | 1fedbe38fd0bbcbf21aa94c1112fec73283729d9 /gcc | |
| parent | 20dac94b00e04fde1c5f4f782c6fb90c35f53290 (diff) | |
| download | gcc-2b5620c634bd54a6bd37007b78334d46ba312ff1.tar.gz | |
* config/c4x/c4x.md: Fix comment.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@83898 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/config/c4x/c4x.md | 18 |
2 files changed, 8 insertions, 18 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b6334b78684..bf7e9080a29 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,4 +1,8 @@ -2004-0630 Akos Kiss <akiss@inf.u-szeged.hu> +2004-06-30 Steven Bosscher <stevenb@suse.de> + + * config/c4x/c4x.md: Fix comment. + +2004-06-30 Akos Kiss <akiss@inf.u-szeged.hu> * arm.md (cond_return_inverted): Add "length" attribute. @@ -4861,7 +4865,7 @@ 2004-05-22 Zack Weinberg <zack@codesourcery.com> - * tree.h (struct tree_decl): Add possibly_inlined bit. + * tree.h (struct tree_decl): Add possibly_inlined bit. (DECL_POSSIBLY_INLINED): New accessor macro. * cgraph.h: Remove declaration of cgraph_inline_hash. * cgraph.c: Remove definition of cgraph_inline_hash. diff --git a/gcc/config/c4x/c4x.md b/gcc/config/c4x/c4x.md index 3c2d2f86e9a..adfdbac9d06 100644 --- a/gcc/config/c4x/c4x.md +++ b/gcc/config/c4x/c4x.md @@ -474,31 +474,17 @@ ]) ; -; C4x FUNCTIONAL UNITS -; -; Define functional units for instruction scheduling to minimize -; pipeline conflicts. +; C4x PIPELINE MODEL ; ; With the C3x, an external memory write (with no wait states) takes ; two cycles and an external memory read (with no wait states) takes ; one cycle. However, an external read following an external write ; takes two cycles. With internal memory, reads and writes take ; half a cycle. -; ; When a C4x address register is loaded it will not be available for ; an extra machine cycle. Calculating with a C4x address register -; makes it unavailable for 2 machine cycles. To notify GCC of these -; pipeline delays, each of the auxiliary and index registers are declared -; as separate functional units. +; makes it unavailable for 2 machine cycles. ; -; (define_function_unit NAME MULTIPLICITY SIMULTANEITY -; TEST READY-DELAY ISSUE-DELAY [CONFLICT-LIST]) -; -; MULTIPLICITY 1 (C4x has no independent identical function units) -; SIMULTANEITY 0 (C4x is pipelined) -; READY_DELAY 1 (Results usually ready after every cyle) -; ISSUE_DELAY 1 (Can issue insns every cycle) - ; Just some dummy definitions. The real work is done in c4x_adjust_cost. ; These are needed so the min/max READY_DELAY is known. |