llvm/test/Transforms/InstCombine/2009-01-31-Pressure.ll

; RUN: opt < %s -instcombine -S | grep "%B = add i8 %b, %x"
; PR2698

declare void @use1(i1)
declare void @use8(i8)

define void @test1(i8 %a, i8 %b, i8 %x) {
  %A = add i8 %a, %x
  %B = add i8 %b, %x
  %C = icmp eq i8 %A, %B
  call void @use1(i1 %C)
  ret void
}

define void @test2(i8 %a, i8 %b, i8 %x) {
  %A = add i8 %a, %x
  %B = add i8 %b, %x
  %C = icmp eq i8 %A, %B
  call void @use1(i1 %C)
  call void @use8(i8 %A)
  ret void
}
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 -instcombine -S \| grep "%B = add i8 %b, %x"`
Reinstate this optimization to fold icmp of xor when possible. Don't try to turn icmp eq a+x, b+x into icmp eq a, b if a+x or b+x has other uses. This may have been increasing register pressure leading to the bzip2 slowdown. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63487 91177308-0d34-0410-b5e6-96231b3b80d8 2009-01-31 21:30:05 +00:00			`; PR2698`

			`declare void @use1(i1)`
			`declare void @use8(i8)`

			`define void @test1(i8 %a, i8 %b, i8 %x) {`
			`%A = add i8 %a, %x`
			`%B = add i8 %b, %x`
			`%C = icmp eq i8 %A, %B`
			`call void @use1(i1 %C)`
			`ret void`
			`}`

			`define void @test2(i8 %a, i8 %b, i8 %x) {`
			`%A = add i8 %a, %x`
			`%B = add i8 %b, %x`
			`%C = icmp eq i8 %A, %B`
			`call void @use1(i1 %C)`
			`call void @use8(i8 %A)`
			`ret void`
			`}`