[llvm] r225214 - [PowerPC] Convert a README.txt entry into a better test

[Duncan P. N. Exon Smith]

I meant this:

This test fails (at least on Darwin):

http://lab.llvm.org:8080/green/view/Clang/job/clang-stage1-cmake-RA-incremental_check/2358/
http://lab.llvm.org:8080/green/view/Clang/job/clang-stage1-cmake-RA-incremental_check/2358/testReport/
http://lab.llvm.org:8080/green/view/Clang/job/clang-stage1-cmake-RA-incremental_check/2358/testReport/LLVM/CodeGen_PowerPC/2007_03_24_cntlzd_ll/

> On 2015-Jan-05, at 13:53, Hal Finkel <hfinkel at anl.gov> wrote:
> 
> Author: hfinkel
> Date: Mon Jan  5 15:53:52 2015
> New Revision: 225214
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=225214&view=rev
> Log:
> [PowerPC] Convert a README.txt entry into a better test
> 
> We now produce the desired code as noted in the README.txt file (no spurious
> or). Remove the README entry and improve the regression test.
> 
> Modified:
>    llvm/trunk/lib/Target/PowerPC/README.txt
>    llvm/trunk/test/CodeGen/PowerPC/2007-03-24-cntlzd.ll
> 
> Modified: llvm/trunk/lib/Target/PowerPC/README.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/README.txt?rev=225214&r1=225213&r2=225214&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Target/PowerPC/README.txt (original)
> +++ llvm/trunk/lib/Target/PowerPC/README.txt Mon Jan  5 15:53:52 2015
> @@ -494,19 +494,6 @@ _bar:
> 
> ===-------------------------------------------------------------------------===
> 
> -test/CodeGen/PowerPC/2007-03-24-cntlzd.ll compiles to:
> -
> -__ZNK4llvm5APInt17countLeadingZerosEv:
> -        ld r2, 0(r3)
> -        cntlzd r2, r2
> -        or r2, r2, r2     <<-- silly.
> -        addi r3, r2, -64
> -        blr 
> -
> -The dead or is a 'truncate' from 64- to 32-bits.
> -
> -===-------------------------------------------------------------------------===
> -
> We generate horrible ppc code for this:
> 
> #define N  2000000
> 
> Modified: llvm/trunk/test/CodeGen/PowerPC/2007-03-24-cntlzd.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/PowerPC/2007-03-24-cntlzd.ll?rev=225214&r1=225213&r2=225214&view=diff
> ==============================================================================
> --- llvm/trunk/test/CodeGen/PowerPC/2007-03-24-cntlzd.ll (original)
> +++ llvm/trunk/test/CodeGen/PowerPC/2007-03-24-cntlzd.ll Mon Jan  5 15:53:52 2015
> @@ -1,4 +1,4 @@
> -; RUN: llc < %s -march=ppc64 -mcpu=g5 | grep cntlzd
> +; RUN: llc < %s -march=ppc64 -mcpu=g5 | FileCheck %s
> 
> define i32 @_ZNK4llvm5APInt17countLeadingZerosEv(i64 *%t) nounwind {
>         %tmp19 = load i64* %t
> @@ -7,6 +7,12 @@ define i32 @_ZNK4llvm5APInt17countLeadin
>         %tmp89 = add i32 %tmp23, -64          ; <i32> [#uses=1]
>         %tmp90 = add i32 %tmp89, 0            ; <i32> [#uses=1]
>         ret i32 %tmp90
> +
> +; CHECK-LABEL: @_ZNK4llvm5APInt17countLeadingZerosEv
> +; CHECK: ld [[REG1:[0-9]+]], 0(3)
> +; CHECK-NEXT: cntlzd [[REG2:[0-9]+]], [[REG1]]
> +; CHECK-NEXT: addi 3, [[REG2]], -64
> +; CHECK-NEXT: blr
> }
> 
> declare i64 @llvm.ctlz.i64(i64, i1)
> 
> 
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