Commit Graph

9 Commits

Author SHA1 Message Date
Hans Wennborg d71907dd07 Don't emit prologues or epilogues for naked functions (PR18791, PR20028)
For naked functions with parameters, Clang would still emit stores in the prologue
that would clobber the stack, because LLVM doesn't set up a stack frame. (This
shows up in -O0 compiles, because the stores are optimized away otherwise.)

For example:

  __attribute__((naked)) int f(int x) {
    asm("movl $42, %eax");
    asm("retl");
  }

Would result in:

  _Z1fi:
  movl    12(%esp), %eax
  movl    %eax, (%esp)    <--- Oops.
  movl    $42, %eax
  retl

Differential Revision: http://reviews.llvm.org/D5183

llvm-svn: 217198
2014-09-04 22:16:33 +00:00
Bill Wendling d02fd83182 Fix testcases to not rely upon target-* attributes.
llvm-svn: 176135
2013-02-26 23:08:48 +00:00
Anna Zaks 0f424b029b Revert "Add more attributes from the command line to functions."
This reverts commit 176009.

The commit is a likely cause of several buildbot failures.

llvm-svn: 176044
2013-02-25 19:51:03 +00:00
Bill Wendling 87869db5f5 Add more attributes from the command line to functions.
This is an ongoing process. Any command line option which a back-end cares about
should be added here.

llvm-svn: 176009
2013-02-25 07:15:16 +00:00
Bill Wendling c33fc4c004 Modify the tests to use attribute group references instead of listing the
function attributes.

llvm-svn: 175606
2013-02-20 07:22:19 +00:00
Bill Wendling 985d1c5d15 Add the 'target-cpu' and 'target-features' attributes to functions.
The back-end will use these values to reconfigure code generation for different
features.

llvm-svn: 175308
2013-02-15 21:30:01 +00:00
Bill Wendling 85ab57ac5d Update the tests.
This update coincides with r174110. That change ordered the attributes
alphabetically.

llvm-svn: 174111
2013-01-31 23:17:12 +00:00
Eli Friedman c55efe4fb2 Make sure we don't inline functions marked with __attribute__((naked)). <rdar://problem/9973228>
llvm-svn: 138310
2011-08-22 23:55:33 +00:00
Daniel Dunbar 8caf6415a8 Add support for attribute((naked)), patch by Zoxc on cfe-commits!
- Minor style tweaks by me.

llvm-svn: 115056
2010-09-29 18:20:25 +00:00