[llvm] r225217 - [PowerPC] Remove old README.txt entry

[Duncan P. N. Exon Smith]

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 14:20, Hal Finkel <hfinkel at anl.gov> wrote:
> 
> Author: hfinkel
> Date: Mon Jan  5 16:20:22 2015
> New Revision: 225217
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=225217&view=rev
> Log:
> [PowerPC] Remove old README.txt entry
> 
> We no longer generate horrible code for the stated function:
> 
> void f(signed char *a, _Bool b, _Bool c) {
>  signed char t = 0;
>  if (b)  t = *a;
>  if (c)  *a = t;
> }
> 
> for which we now generate:
> 
> .L.f:
>        andi. 5, 5, 1
>        cmpldi 1, 4, 0
>        li 5, 0
>        beq 1, .LBB0_2
>        lbz 5, 0(3)
> .LBB0_2:                                # %if.end
>        bclr 4, 1, 0
>        stb 5, 0(3)
>        blr
> 
> so we don't need the README.txt entry.
> 
> Modified:
>    llvm/trunk/lib/Target/PowerPC/README.txt
> 
> Modified: llvm/trunk/lib/Target/PowerPC/README.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/README.txt?rev=225217&r1=225216&r2=225217&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Target/PowerPC/README.txt (original)
> +++ llvm/trunk/lib/Target/PowerPC/README.txt Mon Jan  5 16:20:22 2015
> @@ -211,16 +211,6 @@ _foo:
> 
> ===-------------------------------------------------------------------------===
> 
> -We generate really bad code for this:
> -
> -int f(signed char *a, _Bool b, _Bool c) {
> -   signed char t = 0;
> -  if (b)  t = *a;
> -  if (c)  *a = t;
> -}
> -
> -===-------------------------------------------------------------------------===
> -
> On the G5, logical CR operations are more expensive in their three
> address form: ops that read/write the same register are half as expensive as
> those that read from two registers that are different from their destination.
> 
> 
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