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LLVM backend for 6502
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2e61849f45
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Chris Lattner 2e61849f45 fix a small oversight in the "eliminate memcpy from constant global" 
optimization.  If the alloca that is "memcpy'd from constant" also has
a memcpy from *it*, ignore it: it is a load.  We now optimize the testcase to:

define void @test2() {
  %B = alloca %T
  %a = bitcast %T* @G to i8*
  %b = bitcast %T* %B to i8*
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %b, i8* %a, i64 124, i32 4, i1 false)
  call void @bar(i8* %b)
  ret void
}

previously we would generate:

define void @test() {
  %B = alloca %T
  %b = bitcast %T* %B to i8*
  %G.0 = getelementptr inbounds %T* @G, i32 0, i32 0
  %tmp3 = load i8* %G.0, align 4
  %G.1 = getelementptr inbounds %T* @G, i32 0, i32 1
  %G.15 = bitcast [123 x i8]* %G.1 to i8*
  %1 = bitcast [123 x i8]* %G.1 to i984*
  %srcval = load i984* %1, align 1
  %B.0 = getelementptr inbounds %T* %B, i32 0, i32 0
  store i8 %tmp3, i8* %B.0, align 4
  %B.1 = getelementptr inbounds %T* %B, i32 0, i32 1
  %B.12 = bitcast [123 x i8]* %B.1 to i8*
  %2 = bitcast [123 x i8]* %B.1 to i984*
  store i984 %srcval, i984* %2, align 1
  call void @bar(i8* %b)
  ret void
}



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119682 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-18 06:20:47 +00:00
autoconf fix the autoconf script to detect "has asmprinter"ness of a target by 2010-11-14 19:10:47 +00:00
bindings Try to fix ocaml bindings. 2010-10-08 00:36:21 +00:00
cmake Updated library dependencies. 2010-11-18 00:12:27 +00:00
docs add some justification for "using namespace llvm;" 2010-11-17 19:47:20 +00:00
examples Fix missing includes of "llvm/Analysis/Passes.h" in the tutorials. Thanks 2010-11-16 17:28:22 +00:00
include patch from Frits van Bommel: 2010-11-18 02:15:42 +00:00
lib fix a small oversight in the "eliminate memcpy from constant global" 2010-11-18 06:20:47 +00:00
projects
runtime
test fix a small oversight in the "eliminate memcpy from constant global" 2010-11-18 06:20:47 +00:00
tools Make MCJIT work with CMake. 2010-11-17 23:35:07 +00:00
unittests Revert 119600 to unbreak the build. Francois, please investigate. 2010-11-18 01:38:07 +00:00
utils Remove ARM isel hacks that fold large immediates into a pair of add, sub, and, 2010-11-17 20:13:28 +00:00
website
build-for-llvm-top.sh
CMakeLists.txt Make MCJIT work with CMake. 2010-11-17 23:35:07 +00:00
configure fix the autoconf script to detect "has asmprinter"ness of a target by 2010-11-14 19:10:47 +00:00
CREDITS.TXT Convert a bunch of uses of 'bytecode' into 'bitcode'. This 2010-09-29 20:09:55 +00:00
LICENSE.TXT
llvm.spec.in
Makefile Add --enable-docs. Patch by NAKAMURA Takumi. 2010-11-12 19:24:06 +00:00
Makefile.common
Makefile.config.in Add --enable-docs. Patch by NAKAMURA Takumi. 2010-11-12 19:24:06 +00:00
Makefile.rules remove JIT support from the Alpha backend. The JIT will be moving to MC, 2010-11-14 18:24:41 +00:00
ModuleInfo.txt Remove trailing space. This is just an excuse to poke the 2010-10-05 20:32:15 +00:00
README.txt

README.txt 

\Low Level Virtual Machine (LLVM)
================================

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