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Evan Cheng 5213139f48 Let targets provide hooks that compute known zero and ones for any_extend 
and extload's. If they are implemented as zero-extend, or implicitly
zero-extend, then this can enable more demanded bits optimizations. e.g.

define void @foo(i16* %ptr, i32 %a) nounwind {
entry:
  %tmp1 = icmp ult i32 %a, 100
  br i1 %tmp1, label %bb1, label %bb2
bb1:
  %tmp2 = load i16* %ptr, align 2
  br label %bb2
bb2:
  %tmp3 = phi i16 [ 0, %entry ], [ %tmp2, %bb1 ]
  %cmp = icmp ult i16 %tmp3, 24
  br i1 %cmp, label %bb3, label %exit
bb3:
  call void @bar() nounwind
  br label %exit
exit:
  ret void
}

This compiles to the followings before:
        push    {lr}
        mov     r2, #0
        cmp     r1, #99
        bhi     LBB0_2
@ BB#1:                                 @ %bb1
        ldrh    r2, [r0]
LBB0_2:                                 @ %bb2
        uxth    r0, r2
        cmp     r0, #23
        bhi     LBB0_4
@ BB#3:                                 @ %bb3
        bl      _bar
LBB0_4:                                 @ %exit
        pop     {lr}
        bx      lr

The uxth is not needed since ldrh implicitly zero-extend the high bits. With
this change it's eliminated.

rdar://12771555

llvm-svn: 169459
 		2012-12-06 01:28:01 +00:00
..
Analysis Cost Model: change the default cost of control flow instructions (br / ret / ...) to zero. 2012-12-05 21:21:26 +00:00
Archive Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed. 2012-02-16 06:28:33 +00:00
Assembler Fast-math test case for bitcode and textual reading/writing 2012-11-27 00:45:08 +00:00
Bindings/Ocaml Move TargetData to DataLayout. 2012-10-08 16:39:34 +00:00
Bitcode Change encoding of instruction operands in bitcode binaries to be relative 2012-10-11 20:20:40 +00:00
BugPoint Fix unexpected passes. These test do work with LTO on linux. I tested both 2012-10-26 02:19:02 +00:00
CodeGen Let targets provide hooks that compute known zero and ones for any_extend 2012-12-06 01:28:01 +00:00
DebugInfo Use the 'count' attribute to calculate the upper bound of an array. 2012-12-04 21:34:03 +00:00
ExecutionEngine llvm/test/ExecutionEngine/MCJIT/lit.local.cfg: ppc32-elf is not ready. 2012-11-20 10:49:01 +00:00
Feature Remove the dependent libraries feature. 2012-11-27 09:55:56 +00:00
FileCheck Fix a bug in FileCheck that wouldn't let define variables as follows: 2012-12-02 16:02:41 +00:00
Instrumentation [msan] Instrument bswap intrinsic. 2012-12-05 14:39:55 +00:00
Integer Remove the dependent libraries feature. 2012-11-27 09:55:56 +00:00
JitListener Use the 'count' attribute to calculate the upper bound of an array. 2012-12-04 21:34:03 +00:00
Linker Remove the dependent libraries feature. 2012-11-27 09:55:56 +00:00
MC Correct ARM NOP encoding 2012-12-05 21:01:27 +00:00
Object numerically sort the symbols, so that the testcase result is uniform 2012-11-13 21:01:11 +00:00
Other Using "not grep" is brittle as the test passes if llvm-as fails. 2012-11-21 14:17:23 +00:00
Scripts Added program header emission 2012-11-16 20:51:32 +00:00
TableGen Re-work bit/bits value resolving in tblgen 2012-09-06 23:32:48 +00:00
Transforms fix a typo 2012-12-05 00:33:16 +00:00
Unit
…
Verifier Assert that dominates is not given a multiple edge. Finding out if we have 2012-08-17 18:21:28 +00:00
YAMLParser Convert the uses of '|&' to use '2>&1 |' instead, which works on old 2012-07-02 18:37:59 +00:00
tools PR10867: Analogue of r169441 for when using external 'sh'. And actually run the test! 2012-12-05 23:15:33 +00:00
CMakeLists.txt Adding tests for the Intel JIT event listener's MCJIT support. 2012-11-21 20:38:26 +00:00
Makefile test: Add a lit config variable to check if LTO is enabled. 2012-10-18 20:43:11 +00:00
Makefile.tests
…
TestRunner.sh
…
lit.cfg Adding tests for the Intel JIT event listener's MCJIT support. 2012-11-21 20:38:26 +00:00
lit.site.cfg.in Adding tests for the Intel JIT event listener's MCJIT support. 2012-11-21 20:38:26 +00:00