diff options
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index 4ec5a5ac4b..7087c68173 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -782,3 +782,40 @@ 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 + +//===---------------------------------------------------------------------===// |