Evan implemented these.

llvm-svn: 47828

2 files changed, 0 insertions, 53 deletions

diff --git a/llvm/lib/Target/X86/README-SSE.txt b/llvm/lib/Target/X86/README-SSE.txt
index 2ccabca2fc7..acfe411623c 100644
--- a/llvm/lib/Target/X86/README-SSE.txt
+++ b/llvm/lib/Target/X86/README-SSE.txt
@@ -131,32 +131,6 @@ feasible.
 
 //===---------------------------------------------------------------------===//
 
-Teach the coalescer to commute 2-addr instructions, allowing us to eliminate
-the reg-reg copy in this example:
-
-float foo(int *x, float *y, unsigned c) {
-  float res = 0.0;
-  unsigned i;
-  for (i = 0; i < c; i++) {
-    float xx = (float)x[i];
-    xx = xx * y[i];
-    xx += res;
-    res = xx;
-  }
-  return res;
-}
-
-LBB_foo_3:      # no_exit
-        cvtsi2ss %XMM0, DWORD PTR [%EDX + 4*%ESI]
-        mulss %XMM0, DWORD PTR [%EAX + 4*%ESI]
-        addss %XMM0, %XMM1
-        inc %ESI
-        cmp %ESI, %ECX
-****    movaps %XMM1, %XMM0
-        jb LBB_foo_3    # no_exit
-
-//===---------------------------------------------------------------------===//
-
 Codegen:
   if (copysign(1.0, x) == copysign(1.0, y))
 into:
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt
index fccddc79f46..65de926a3e6 100644
--- a/llvm/lib/Target/X86/README.txt
+++ b/llvm/lib/Target/X86/README.txt
@@ -933,33 +933,6 @@ _test:
 
 //===---------------------------------------------------------------------===//
 
-This is a "commutable two-address" register coallescing deficiency:
-
-define <4 x float> @test1(<4 x float> %V) {
-entry:
-        %tmp8 = shufflevector <4 x float> %V, <4 x float> undef,
-                                        <4 x i32> < i32 3, i32 2, i32 1, i32 0 >
-        %add = add <4 x float> %tmp8, %V
-        ret <4 x float> %add
-}
-
-this codegens to:
-
-_test1:
-        pshufd  $27, %xmm0, %xmm1
-        addps   %xmm0, %xmm1
-        movaps  %xmm1, %xmm0
-        ret
-
-instead of:
-
-_test1:
-        pshufd  $27, %xmm0, %xmm1
-        addps   %xmm1, %xmm0
-        ret
-
-//===---------------------------------------------------------------------===//
-
 Leaf functions that require one 4-byte spill slot have a prolog like this:
 
 _foo: