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11e8b74a7a
"long latency" enough to hoist even if it may increase spilling. Reloading a value from spill slot is often cheaper than performing an expensive computation in the loop. For X86, that means machine LICM will hoist SQRT, DIV, etc. ARM will be somewhat aggressive with VFP and NEON instructions. - Enable register pressure aware machine LICM by default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116781 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.7 KiB
LLVM
53 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=i386-apple-darwin -mattr=+sse2 -stats |& FileCheck %s
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; Now this test spills one register. But a reload in the loop is cheaper than
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; the divsd so it's a win.
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define fastcc void @fourn(double* %data, i32 %isign) nounwind {
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; CHECK: fourn
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%indvar93 = phi i32 [ 0, %entry ], [ %idim.030, %bb ] ; <i32> [#uses=2]
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%idim.030 = add i32 %indvar93, 1 ; <i32> [#uses=1]
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%0 = add i32 %indvar93, 2 ; <i32> [#uses=1]
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%1 = icmp sgt i32 %0, 2 ; <i1> [#uses=1]
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br i1 %1, label %bb30.loopexit, label %bb
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; CHECK: %bb30.loopexit
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; CHECK: divsd %xmm0
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; CHECK: movsd %xmm0, 16(%esp)
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; CHECK: .align
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; CHECK-NEXT: %bb3
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bb3: ; preds = %bb30.loopexit, %bb25, %bb3
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%2 = load i32* null, align 4 ; <i32> [#uses=1]
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%3 = mul i32 %2, 0 ; <i32> [#uses=1]
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%4 = icmp slt i32 0, %3 ; <i1> [#uses=1]
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br i1 %4, label %bb18, label %bb3
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bb18: ; preds = %bb3
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%5 = fdiv double %11, 0.000000e+00 ; <double> [#uses=1]
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%6 = tail call double @sin(double %5) nounwind readonly ; <double> [#uses=1]
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br label %bb24.preheader
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bb22.preheader: ; preds = %bb24.preheader, %bb22.preheader
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br label %bb22.preheader
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bb25: ; preds = %bb24.preheader
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%7 = fmul double 0.000000e+00, %6 ; <double> [#uses=0]
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%8 = add i32 %i3.122100, 0 ; <i32> [#uses=1]
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%9 = icmp sgt i32 %8, 0 ; <i1> [#uses=1]
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br i1 %9, label %bb3, label %bb24.preheader
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bb24.preheader: ; preds = %bb25, %bb18
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%i3.122100 = or i32 0, 1 ; <i32> [#uses=2]
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%10 = icmp slt i32 0, %i3.122100 ; <i1> [#uses=1]
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br i1 %10, label %bb25, label %bb22.preheader
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bb30.loopexit: ; preds = %bb
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%11 = fmul double 0.000000e+00, 0x401921FB54442D1C ; <double> [#uses=1]
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br label %bb3
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}
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declare double @sin(double) nounwind readonly
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