63917e1975
Sometimes, loads can appear in a loop after the LICM pass is executed the final time. For example, ExpandMemCmp pass creates loads in a loop, and one of the operands may be an invariant address. This patch extends the pre-regalloc stage MachineLICM by allowing to hoist invariant loads from loops that don't have any stores or calls and allows load reorderings.
57 lines
2.1 KiB
LLVM
57 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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define void @f() {
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; CHECK-LABEL: f:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
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; CHECK-NEXT: movapd %xmm0, %xmm1
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; CHECK-NEXT: mulsd %xmm0, %xmm1
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; CHECK-NEXT: subsd %xmm0, %xmm1
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; CHECK-NEXT: .p2align 4, 0x90
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; CHECK-NEXT: .LBB0_1: # %for.cond
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: imull %eax, %eax
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; CHECK-NEXT: cwtl
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; CHECK-NEXT: xorps %xmm2, %xmm2
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; CHECK-NEXT: cvtsi2sd %eax, %xmm2
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; CHECK-NEXT: mulsd %xmm0, %xmm2
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; CHECK-NEXT: mulsd %xmm0, %xmm2
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; CHECK-NEXT: movapd %xmm2, %xmm3
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; CHECK-NEXT: mulsd %xmm1, %xmm3
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; CHECK-NEXT: mulsd %xmm0, %xmm2
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; CHECK-NEXT: movapd %xmm1, %xmm4
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; CHECK-NEXT: subsd %xmm3, %xmm4
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; CHECK-NEXT: addsd %xmm2, %xmm4
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; CHECK-NEXT: cvttsd2si %xmm4, %eax
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; CHECK-NEXT: jmp .LBB0_1
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entry:
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br label %for.cond
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for.cond: ; preds = %for.cond, %entry
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%b.0 = phi i16 [ 0, %entry ], [ %conv77, %for.cond ]
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%mul18 = mul i16 %b.0, %b.0
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%arrayidx.real = load double, ptr undef, align 1
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%arrayidx.imag = load double, ptr undef, align 1
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%mul_ac = fmul fast double %arrayidx.real, %arrayidx.real
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%0 = fadd fast double 0.000000e+00, %arrayidx.real
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%sub.r = fsub fast double %mul_ac, %0
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%sub.i = fsub fast double 0.000000e+00, %arrayidx.imag
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%conv28 = sitofp i16 %mul18 to double
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%mul_bc32 = fmul fast double %arrayidx.imag, %conv28
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%mul_bd46 = fmul fast double %mul_bc32, %arrayidx.imag
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%mul_r49 = fsub fast double 0.000000e+00, %mul_bd46
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%mul_ac59 = fmul fast double %mul_r49, %sub.r
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%mul_bc48 = fmul fast double %mul_bc32, %arrayidx.real
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%mul_i50 = fadd fast double 0.000000e+00, %mul_bc48
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%1 = fmul fast double %mul_i50, %sub.i
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%.neg = fneg fast double %0
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%.neg19 = fmul fast double %1, -1.000000e+00
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%.neg20 = fadd fast double %.neg, %mul_ac
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%2 = fadd fast double %.neg20, %mul_ac59
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%sub.r75 = fadd fast double %2, %.neg19
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%conv77 = fptosi double %sub.r75 to i16
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br label %for.cond
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}
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