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1c062c24ab
When widening a copy, we are reading a larger register that may not be live. Use an <undef> flag to tell the register scavenger and machine code verifier that we know the value isn't defined. We now widen: %S6<def> = COPY %S4<kill>, %D3<imp-def> into: %D3<def> = VMOVD %D2<undef>, pred:14, pred:%noreg, %S4<imp-use,kill> This also keeps the <kill> flag on %S4 so we don't inadvertently kill a live value in %S5. Finally, ensure that ARMBaseInstrInfo::setExecutionDomain() preserves the <undef> flag when converting VMOVD to VORR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141746 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.1 KiB
LLVM
36 lines
1.1 KiB
LLVM
; RUN: llc < %s -widen-vmovs -mcpu=cortex-a8 -verify-machineinstrs | FileCheck %s
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target triple = "thumbv7-apple-ios"
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; The 0.0 constant is loaded from the constant pool and kept in a register.
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; CHECK: %entry
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; CHECK: vldr.32 s
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; The float loop variable is initialized with a vmovs from the constant register.
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; The vmovs is first widened to a vmovd, and then converted to a vorr because of the v2f32 vadd.f32.
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; CHECK: vorr [[DL:d[0-9]+]], [[DN:d[0-9]+]]
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; CHECK: , [[DN]]
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; CHECK: %for.body.i
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; CHECK: vadd.f32 [[DL]], [[DL]], [[DN]]
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;
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; This test is verifying:
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; - The VMOVS widening is happening.
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; - Register liveness is verified.
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; - The execution domain switch to vorr works across basic blocks.
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define void @Mm() nounwind {
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entry:
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br label %for.body4
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for.body4:
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br label %for.body.i
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for.body.i:
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%tmp3.i = phi float [ 0.000000e+00, %for.body4 ], [ %add.i, %for.body.i ]
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%add.i = fadd float %tmp3.i, 0.000000e+00
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%exitcond.i = icmp eq i32 undef, 41
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br i1 %exitcond.i, label %rInnerproduct.exit, label %for.body.i
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rInnerproduct.exit:
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store float %add.i, float* undef, align 4
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br label %for.body4
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}
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