[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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225217 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt
index 9571e4a0616227628e0dcb0edaeaf1b21e2a283c..4708838ba0f5d36127804b58196a69537fc78d79 100644 (file)
--- a/lib/Target/PowerPC/README.txt
+++ b/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.