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[Bug c/33949] gcc-4.2.2 generates bad code on ARM
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Oct 2007 15:54:27 -0000
- Subject: [Bug c/33949] gcc-4.2.2 generates bad code on ARM
- References: <bug-33949-15284@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from rguenth at gcc dot gnu dot org 2007-10-30 15:54 -------
It doesn't matter that you store the address of param to a volatile variable
(this store is not removed), but that
DMA_ADDR_REG = (unsigned long) data;
does not make the stack local live longer than the frame of outer_func and
*data is not used after the assignment. Probably your code kicking off
the DMA engine lacks a memory barrier and a use of DMA_ADDR_REG.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33949