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llvm-project/llvm/test/Transforms/InstCombine/phi-merge-gep.ll

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Don't sink gep operators through phi nodes if the result would require more than one phi, since that leads to higher register pressure on entry to the phi. This is especially problematic when the phi is in a loop header, as it increases register pressure throughout the loop. llvm-svn: 81993
2009-09-16 10:01:52 +08:00
; RUN: opt < %s -S -instcombine > %t
; RUN: grep {= getelementptr} %t | count 20
; RUN: grep {= phi} %t | count 13
Fix the comment in this test. llvm-svn: 82051
2009-09-17 00:33:59 +08:00
; Don't push the geps through these phis, because they would require
; two phis each, which burdens the loop with high register pressure.
Don't sink gep operators through phi nodes if the result would require more than one phi, since that leads to higher register pressure on entry to the phi. This is especially problematic when the phi is in a loop header, as it increases register pressure throughout the loop. llvm-svn: 81993
2009-09-16 10:01:52 +08:00
define void @foo(float* %Ar, float* %Ai, i64 %As, float* %Cr, float* %Ci, i64 %Cs, i64 %n) nounwind {
entry:
%0 = getelementptr inbounds float* %Ar, i64 0 ; <float*> [#uses=1]
%1 = getelementptr inbounds float* %Ai, i64 0 ; <float*> [#uses=1]
%2 = mul i64 %n, %As ; <i64> [#uses=1]
%3 = getelementptr inbounds float* %Ar, i64 %2 ; <float*> [#uses=1]
%4 = mul i64 %n, %As ; <i64> [#uses=1]
%5 = getelementptr inbounds float* %Ai, i64 %4 ; <float*> [#uses=1]
%6 = mul i64 %n, 2 ; <i64> [#uses=1]
%7 = mul i64 %6, %As ; <i64> [#uses=1]
%8 = getelementptr inbounds float* %Ar, i64 %7 ; <float*> [#uses=1]
%9 = mul i64 %n, 2 ; <i64> [#uses=1]
%10 = mul i64 %9, %As ; <i64> [#uses=1]
%11 = getelementptr inbounds float* %Ai, i64 %10 ; <float*> [#uses=1]
%12 = getelementptr inbounds float* %Cr, i64 0 ; <float*> [#uses=1]
%13 = getelementptr inbounds float* %Ci, i64 0 ; <float*> [#uses=1]
%14 = mul i64 %n, %Cs ; <i64> [#uses=1]
%15 = getelementptr inbounds float* %Cr, i64 %14 ; <float*> [#uses=1]
%16 = mul i64 %n, %Cs ; <i64> [#uses=1]
%17 = getelementptr inbounds float* %Ci, i64 %16 ; <float*> [#uses=1]
%18 = mul i64 %n, 2 ; <i64> [#uses=1]
%19 = mul i64 %18, %Cs ; <i64> [#uses=1]
%20 = getelementptr inbounds float* %Cr, i64 %19 ; <float*> [#uses=1]
%21 = mul i64 %n, 2 ; <i64> [#uses=1]
%22 = mul i64 %21, %Cs ; <i64> [#uses=1]
%23 = getelementptr inbounds float* %Ci, i64 %22 ; <float*> [#uses=1]
br label %bb13
bb: ; preds = %bb13
%24 = load float* %A0r.0, align 4 ; <float> [#uses=1]
%25 = load float* %A0i.0, align 4 ; <float> [#uses=1]
%26 = load float* %A1r.0, align 4 ; <float> [#uses=2]
%27 = load float* %A1i.0, align 4 ; <float> [#uses=2]
%28 = load float* %A2r.0, align 4 ; <float> [#uses=2]
%29 = load float* %A2i.0, align 4 ; <float> [#uses=2]
%30 = fadd float %26, %28 ; <float> [#uses=2]
%31 = fadd float %27, %29 ; <float> [#uses=2]
%32 = fsub float %26, %28 ; <float> [#uses=1]
%33 = fsub float %27, %29 ; <float> [#uses=1]
%34 = fadd float %24, %30 ; <float> [#uses=2]
%35 = fadd float %25, %31 ; <float> [#uses=2]
%36 = fmul float %30, -1.500000e+00 ; <float> [#uses=1]
%37 = fmul float %31, -1.500000e+00 ; <float> [#uses=1]
%38 = fadd float %34, %36 ; <float> [#uses=2]
%39 = fadd float %35, %37 ; <float> [#uses=2]
%40 = fmul float %32, 0x3FEBB67AE0000000 ; <float> [#uses=2]
%41 = fmul float %33, 0x3FEBB67AE0000000 ; <float> [#uses=2]
%42 = fadd float %38, %41 ; <float> [#uses=1]
%43 = fsub float %39, %40 ; <float> [#uses=1]
%44 = fsub float %38, %41 ; <float> [#uses=1]
%45 = fadd float %39, %40 ; <float> [#uses=1]
store float %34, float* %C0r.0, align 4
store float %35, float* %C0i.0, align 4
store float %42, float* %C1r.0, align 4
store float %43, float* %C1i.0, align 4
store float %44, float* %C2r.0, align 4
store float %45, float* %C2i.0, align 4
%46 = getelementptr inbounds float* %A0r.0, i64 %As ; <float*> [#uses=1]
%47 = getelementptr inbounds float* %A0i.0, i64 %As ; <float*> [#uses=1]
%48 = getelementptr inbounds float* %A1r.0, i64 %As ; <float*> [#uses=1]
%49 = getelementptr inbounds float* %A1i.0, i64 %As ; <float*> [#uses=1]
%50 = getelementptr inbounds float* %A2r.0, i64 %As ; <float*> [#uses=1]
%51 = getelementptr inbounds float* %A2i.0, i64 %As ; <float*> [#uses=1]
%52 = getelementptr inbounds float* %C0r.0, i64 %Cs ; <float*> [#uses=1]
%53 = getelementptr inbounds float* %C0i.0, i64 %Cs ; <float*> [#uses=1]
%54 = getelementptr inbounds float* %C1r.0, i64 %Cs ; <float*> [#uses=1]
%55 = getelementptr inbounds float* %C1i.0, i64 %Cs ; <float*> [#uses=1]
%56 = getelementptr inbounds float* %C2r.0, i64 %Cs ; <float*> [#uses=1]
%57 = getelementptr inbounds float* %C2i.0, i64 %Cs ; <float*> [#uses=1]
%58 = add nsw i64 %i.0, 1 ; <i64> [#uses=1]
br label %bb13
bb13: ; preds = %bb, %entry
%i.0 = phi i64 [ 0, %entry ], [ %58, %bb ] ; <i64> [#uses=2]
%C2i.0 = phi float* [ %23, %entry ], [ %57, %bb ] ; <float*> [#uses=2]
%C2r.0 = phi float* [ %20, %entry ], [ %56, %bb ] ; <float*> [#uses=2]
%C1i.0 = phi float* [ %17, %entry ], [ %55, %bb ] ; <float*> [#uses=2]
%C1r.0 = phi float* [ %15, %entry ], [ %54, %bb ] ; <float*> [#uses=2]
%C0i.0 = phi float* [ %13, %entry ], [ %53, %bb ] ; <float*> [#uses=2]
%C0r.0 = phi float* [ %12, %entry ], [ %52, %bb ] ; <float*> [#uses=2]
%A2i.0 = phi float* [ %11, %entry ], [ %51, %bb ] ; <float*> [#uses=2]
%A2r.0 = phi float* [ %8, %entry ], [ %50, %bb ] ; <float*> [#uses=2]
%A1i.0 = phi float* [ %5, %entry ], [ %49, %bb ] ; <float*> [#uses=2]
%A1r.0 = phi float* [ %3, %entry ], [ %48, %bb ] ; <float*> [#uses=2]
%A0i.0 = phi float* [ %1, %entry ], [ %47, %bb ] ; <float*> [#uses=2]
%A0r.0 = phi float* [ %0, %entry ], [ %46, %bb ] ; <float*> [#uses=2]
%59 = icmp slt i64 %i.0, %n ; <i1> [#uses=1]
br i1 %59, label %bb, label %bb14
bb14: ; preds = %bb13
br label %return
return: ; preds = %bb14
ret void
}