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| author | Chris Lattner <sabre@nondot.org> | 2008-03-09 05:42:06 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-03-09 05:42:06 +0000 |
| commit | 67f453aae7ac55f30af9e961a21029beabaaf47b (patch) | |
| tree | 7a7fd9ea19992b97cc52890188a1cdab8940c738 /test/CodeGen/X86/vec_set-B.ll | |
| parent | 529de8a45702cd34968d79d13f95ed1e5d5fa250 (diff) | |
| download | llvm-67f453aae7ac55f30af9e961a21029beabaaf47b.tar.gz llvm-67f453aae7ac55f30af9e961a21029beabaaf47b.tar.bz2 llvm-67f453aae7ac55f30af9e961a21029beabaaf47b.tar.xz | |
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
Diffstat (limited to 'test/CodeGen/X86/vec_set-B.ll')
| -rw-r--r-- | test/CodeGen/X86/vec_set-B.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/CodeGen/X86/vec_set-B.ll b/test/CodeGen/X86/vec_set-B.ll new file mode 100644 index 0000000000..e4e5667d2f --- /dev/null +++ b/test/CodeGen/X86/vec_set-B.ll @@ -0,0 +1,24 @@ +; RUN: llvm-as < %s | llc -march=x86 | not grep movaps +; RUN: llvm-as < %s | llc -march=x86 | grep esp | count 2 + +; These should both generate something like this: +;_test3: +; movl $1234567, %eax +; andl 4(%esp), %eax +; movd %eax, %xmm0 +; ret + +define <2 x i64> @test3(i64 %arg) { +entry: + %A = and i64 %arg, 1234567 + %B = insertelement <2 x i64> zeroinitializer, 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> undef, i64 %A, i32 0 + ret <2 x i64> %B +} + |