From 875357d213ab1830efa1e3e9de0fcde95df7eefc Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Thu, 13 Mar 2008 06:37:55 +0000 Subject: TwoAddressInstructionPass enhancement. After it converts a two address instruction into a 3-address one, sink it past the instruction that kills the read-mod-write register if its definition is used past the kill. This reduces the number of live register by one. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48333 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/CodeGen/X86/twoaddr-pass-sink.ll | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 test/CodeGen/X86/twoaddr-pass-sink.ll (limited to 'test/CodeGen/X86/twoaddr-pass-sink.ll') diff --git a/test/CodeGen/X86/twoaddr-pass-sink.ll b/test/CodeGen/X86/twoaddr-pass-sink.ll new file mode 100644 index 0000000000..765588059f --- /dev/null +++ b/test/CodeGen/X86/twoaddr-pass-sink.ll @@ -0,0 +1,29 @@ +; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -stats |& grep {Number of 3-address instructions sunk} + +define void @t2(<2 x i64>* %vDct, <2 x i64>* %vYp, i8* %skiplist, <2 x i64> %a1) nounwind { +entry: + %tmp25 = bitcast <2 x i64> %a1 to <8 x i16> ; <<8 x i16>> [#uses=1] + br label %bb +bb: ; preds = %bb, %entry + %skiplist_addr.0.rec = phi i32 [ 0, %entry ], [ %indvar.next, %bb ] ; [#uses=3] + %vYp_addr.0.rec = shl i32 %skiplist_addr.0.rec, 3 ; [#uses=3] + %vDct_addr.0 = getelementptr <2 x i64>* %vDct, i32 %vYp_addr.0.rec ; <<2 x i64>*> [#uses=1] + %vYp_addr.0 = getelementptr <2 x i64>* %vYp, i32 %vYp_addr.0.rec ; <<2 x i64>*> [#uses=1] + %skiplist_addr.0 = getelementptr i8* %skiplist, i32 %skiplist_addr.0.rec ; [#uses=1] + %vDct_addr.0.sum43 = or i32 %vYp_addr.0.rec, 1 ; [#uses=1] + %tmp7 = getelementptr <2 x i64>* %vDct, i32 %vDct_addr.0.sum43 ; <<2 x i64>*> [#uses=1] + %tmp8 = load <2 x i64>* %tmp7, align 16 ; <<2 x i64>> [#uses=1] + %tmp11 = load <2 x i64>* %vDct_addr.0, align 16 ; <<2 x i64>> [#uses=1] + %tmp13 = bitcast <2 x i64> %tmp8 to <8 x i16> ; <<8 x i16>> [#uses=1] + %tmp15 = bitcast <2 x i64> %tmp11 to <8 x i16> ; <<8 x i16>> [#uses=1] + %tmp16 = shufflevector <8 x i16> %tmp15, <8 x i16> %tmp13, <8 x i32> < i32 0, i32 8, i32 1, i32 9, i32 2, i32 10, i32 3, i32 11 > ; <<8 x i16>> [#uses=1] + %tmp26 = mul <8 x i16> %tmp25, %tmp16 ; <<8 x i16>> [#uses=1] + %tmp27 = bitcast <8 x i16> %tmp26 to <2 x i64> ; <<2 x i64>> [#uses=1] + store <2 x i64> %tmp27, <2 x i64>* %vYp_addr.0, align 16 + %tmp37 = load i8* %skiplist_addr.0, align 1 ; [#uses=1] + %tmp38 = icmp eq i8 %tmp37, 0 ; [#uses=1] + %indvar.next = add i32 %skiplist_addr.0.rec, 1 ; [#uses=1] + br i1 %tmp38, label %return, label %bb +return: ; preds = %bb + ret void +} -- cgit v1.2.3