From: Hal Finkel <hfinkel@anl.gov>
Date: Mon, 5 Jan 2015 22:20:22 +0000 (+0000)
Subject: [PowerPC] Remove old README.txt entry
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6837077fcf393b1acf6a7b3dd1f6833b75ee90bb;p=platform%2Fupstream%2Fllvm.git

[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.

llvm-svn: 225217
---

diff --git a/llvm/lib/Target/PowerPC/README.txt b/llvm/lib/Target/PowerPC/README.txt
index 9571e4a..4708838 100644
--- a/llvm/lib/Target/PowerPC/README.txt
+++ b/llvm/lib/Target/PowerPC/README.txt
@@ -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.