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# a7a61e27 26-Jan-2012 Bob Wilson <bob.wilson@apple.com>

Make clz/ctz builtins defined for zero on ARM targets. rdar://10732455

ARM supports clz and ctz directly and both operations have well-defined
results for zero. There is no disadvantage in perform

Make clz/ctz builtins defined for zero on ARM targets. rdar://10732455

ARM supports clz and ctz directly and both operations have well-defined
results for zero. There is no disadvantage in performance to using the
defined-at-zero versions of llvm.ctlz/cttz intrinsics. We're running into
ARM-specific code written with the assumption that __builtin_clz(0) == 32,
even though that value is technically undefined. The code is failing now
because of llvm optimizations that are taking advantage of the undef
behavior (specifically svn r147255). There's nothing wrong with that
optimization on x86 where any incorrect assumptions about __builtin_clz(0)
will quickly be exposed. For ARM, though, optimizations based on that undef
behavior are likely to cause subtle bugs. Other targets with defined-at-zero
clz/ctz support may want to override the default behavior as well.

llvm-svn: 149086

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Revision tags: llvmorg-3.0.0, llvmorg-3.0.0-rc4, llvmorg-3.0.0-rc3, llvmorg-3.0.0-rc2, llvmorg-3.0.0-rc1, llvmorg-2.9.0, llvmorg-2.9.0-rc3, llvmorg-2.9.0-rc2, llvmorg-2.9.0-rc1, llvmorg-2.8.0, llvmorg-2.8.0-rc3, llvmorg-2.8.0-rc2, llvmorg-2.8.0-rc1, llvmorg-2.8.0-rc0, llvmorg-2.7.0
# 8fbe78f6 15-Dec-2009 Daniel Dunbar <daniel@zuster.org>

Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
- This is designed to make it obvious that %clang_cc1 is a "test variable"
which is substituted. It is '%clang_cc1' instead o

Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
- This is designed to make it obvious that %clang_cc1 is a "test variable"
which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
can be useful to redefine what gets run as 'clang -cc1' (for example, to set
a default target).

llvm-svn: 91446

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# 8b576979 08-Nov-2009 Daniel Dunbar <daniel@zuster.org>

Eliminate &&s in tests.
- 'for i in $(find . -type f); do sed -e 's#\(RUN:.*[^ ]\) *&& *$#\1#g' $i | FileUpdate $i; done', for the curious.

llvm-svn: 86430
Revision tags: llvmorg-2.6.0
# a45cf5b6 24-Mar-2009 Daniel Dunbar <daniel@zuster.org>

Rename clang to clang-cc.

Tests and drivers updated, still need to shuffle dirs.

llvm-svn: 67602
Revision tags: llvmorg-2.5.0, llvmorg-2.4.0
# 351763e1 12-Jun-2008 Argyrios Kyrtzidis <akyrtzi@gmail.com>

Multiple tests in a single test file must be linked with '&&'.
Otherwise, failing tests other than the last one will not be reported.

llvm-svn: 52231
Revision tags: llvmorg-2.3.0
# 5e2281ed 27-May-2008 Eli Friedman <eli.friedman@gmail.com>

Implementation of __builtin_ctlz.

llvm-svn: 51595