Evan Cheng 8a7186dbc2 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169459 91177308-0d34-0410-b5e6-96231b3b80d8		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
Assembler	Fast-math test case for bitcode and textual reading/writing	2012-11-27 00:45:08 +00:00
Bindings/Ocaml
Bitcode
BugPoint
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
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
Other
Scripts
TableGen
tools	PR10867: Analogue of r169441 for when using external 'sh'. And actually run the test!	2012-12-05 23:15:33 +00:00
Transforms	fix a typo	2012-12-05 00:33:16 +00:00
Unit
Verifier
YAMLParser
CMakeLists.txt	Adding tests for the Intel JIT event listener's MCJIT support.	2012-11-21 20:38:26 +00:00
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
Makefile
Makefile.tests
TestRunner.sh