Sanjoy Das e5f4889ba9 [InstCombine] Optimize icmp slt signum(x), 1 --> icmp slt x, 1 ...

Summary:
`signum(x)` is sometimes implemented as `(x >> 63) | (-x >>> 63)` (for
an `i64` `x`).  This change adds a matcher for that pattern, and an
instcombine rule to optimize `signum(x) s< 1`.

Later, we can also consider optimizing:

  icmp slt signum(x), 0 --> icmp slt x, 0
  icmp sle signum(x), 1 --> true

etc.

Reviewers: majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12703

llvm-svn: 247846

2015-09-16 20:41:29 +00:00

clang

[WinEH] Pass the catch adjectives to catchpad directly

2015-09-16 20:15:55 +00:00

clang-tools-extra

[clang-tidy] Ignore spaces in -checks=

2015-09-16 16:16:53 +00:00

compiler-rt

[Windows] xfail a test that uses C++ EH

2015-09-16 20:32:22 +00:00

debuginfo-tests

…

libclc

integer: Update integer limits to comply with spec

2015-09-15 03:56:21 +00:00

libcxx

Add endianness configuration block for GCC.

2015-09-16 18:10:47 +00:00

libcxxabi

…

libunwind

…

lld

Relax the test to fix some bots.

2015-09-16 19:48:57 +00:00

lldb

add a dependency on terminfo library if llvm uses it

2015-09-16 20:14:01 +00:00

llgo

…

llvm

[InstCombine] Optimize icmp slt signum(x), 1 --> icmp slt x, 1

2015-09-16 20:41:29 +00:00

openmp

Force the readelf call to be in English

2015-09-16 12:01:14 +00:00

polly

Add option to enable/disable reduction usage in dependence analysis

2015-09-16 09:50:17 +00:00

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