llvm-6502/test/Transforms/GVN/local-pre.ll

; RUN: opt < %s -gvn -enable-pre -S | grep "b.pre"

define i32 @main(i32 %p, i32 %q) {
block1:
    %cmp = icmp eq i32 %p, %q 
	br i1 %cmp, label %block2, label %block3

block2:
 %a = add i32 %p, 1
 br label %block4

block3:
  br label %block4

block4:
  %b = add i32 %p, 1
  ret i32 %b
}
Convert all tests using TCL-style quoting to use shell-style quoting. This was done through the aid of a terrible Perl creation. I will not paste any of the horrors here. Suffice to say, it require multiple staged rounds of replacements, state carried between, and a few nested-construct-parsing hacks that I'm not proud of. It happens, by luck, to be able to deal with all the TCL-quoting patterns in evidence in the LLVM test suite. If anyone is maintaining large out-of-tree test trees, feel free to poke me and I'll send you the steps I used to convert things, as well as answer any painful questions etc. IRC works best for this type of thing I find. Once converted, switch the LLVM lit config to use ShTests the same as Clang. In addition to being able to delete large amounts of Python code from 'lit', this will also simplify the entire test suite and some of lit's architecture. Finally, the test suite runs 33% faster on Linux now. ;] For my 16-hardware-thread (2x 4-core xeon e5520): 36s -> 24s git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159525 91177308-0d34-0410-b5e6-96231b3b80d8 2012-07-02 12:47:22 +00:00			`; RUN: opt < %s -gvn -enable-pre -S \| grep "b.pre"`
Add local PRE to GVN. This only operates in cases where it would not increase code size, namely when the instantiated expression would only need to be created in one predecessor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52471 91177308-0d34-0410-b5e6-96231b3b80d8 2008-06-18 21:41:49 +00:00
Resurrect r191017 " GVN proceeds in the presence of dead code" plus a fix to PR17307 & 17308. The problem of r191017 is that when GVN fabricate a val-number for a dead instruction (in order to make following expr-PRE happy), it forget to fabricate a leader-table entry for it as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191118 91177308-0d34-0410-b5e6-96231b3b80d8 2013-09-20 23:12:57 +00:00			`define i32 @main(i32 %p, i32 %q) {`
Add local PRE to GVN. This only operates in cases where it would not increase code size, namely when the instantiated expression would only need to be created in one predecessor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52471 91177308-0d34-0410-b5e6-96231b3b80d8 2008-06-18 21:41:49 +00:00			`block1:`
Resurrect r191017 " GVN proceeds in the presence of dead code" plus a fix to PR17307 & 17308. The problem of r191017 is that when GVN fabricate a val-number for a dead instruction (in order to make following expr-PRE happy), it forget to fabricate a leader-table entry for it as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191118 91177308-0d34-0410-b5e6-96231b3b80d8 2013-09-20 23:12:57 +00:00			`%cmp = icmp eq i32 %p, %q`
			`br i1 %cmp, label %block2, label %block3`
Add local PRE to GVN. This only operates in cases where it would not increase code size, namely when the instantiated expression would only need to be created in one predecessor. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52471 91177308-0d34-0410-b5e6-96231b3b80d8 2008-06-18 21:41:49 +00:00
			`block2:`
			`%a = add i32 %p, 1`
			`br label %block4`

			`block3:`
			`br label %block4`

			`block4:`
			`%b = add i32 %p, 1`
			`ret i32 %b`
			`}`