Finish implementing a readme entry: when inserting an i64 variable

into a vector of zeros or undef, and when the top part is obviously
zero, we can just use movd + shuffle.  This allows us to compile
vec_set-B.ll into:

_test3:
	movl	$1234567, %eax
	andl	4(%esp), %eax
	movd	%eax, %xmm0
	ret

instead of:

_test3:
	subl	$28, %esp
	movl	$1234567, %eax
	andl	32(%esp), %eax
	movl	%eax, (%esp)
	movl	$0, 4(%esp)
	movq	(%esp), %xmm0
	addl	$28, %esp
	ret



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48090 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 38 deletions

diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt
index 7087c68..4d72245 100644
--- a/lib/Target/X86/README-SSE.txt
+++ b/lib/Target/X86/README-SSE.txt
@@ -781,41 +781,3 @@ LLVM should be able to generate the same thing as gcc.  This looks like it is
 just a matter of matching (scalar_to_vector (load x)) to movd.
 
 //===---------------------------------------------------------------------===//
-
-These two functions should compile to identical code on x86-32:
-
-define <2 x i64> @test2(i64 %arg) {
-entry:
-	%A = and i64 %arg, 1234567
-	%B = insertelement <2 x i64> undef, i64 %A, i32 0
-	ret <2 x i64> %B
-}
-
-define <2 x i64> @test2(i64 %arg) {
-entry:
-        %A = and i64 %arg, 1234567
-        %B = insertelement <2 x i64> zeroinitializer, i64 %A, i32 0
-        ret <2 x i64> %B
-}
-
-The later compiles to:
-
-_test2:
-	movl	$1234567, %eax
-	andl	4(%esp), %eax
-	movd	%eax, %xmm0
-	ret
-
-the former compiles to:
-
-_test2:
-	subl	$28, %esp
-	movl	$1234567, %eax
-	andl	32(%esp), %eax
-	movl	%eax, (%esp)
-	movl	$0, 4(%esp)
-	movaps	(%esp), %xmm0
-	addl	$28, %esp
-	ret
-
-//===---------------------------------------------------------------------===//