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ac1d337386
This prevents us from doing things like LICM'ing it out of a loop, which is usually a net loss because we end up having to spill a callee-saved FPR to accomodate it. This does perturb instruction scheduling around this instruction, so a number of tests had to be updated to account for it. Reviewed By: t.p.northover Differential Revision: https://reviews.llvm.org/D87316
34 lines
1.0 KiB
LLVM
34 lines
1.0 KiB
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s
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; The purpose of this test is to check that an FMOV instruction that
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; only materializes an immediate is not MachineLICM'd out of a loop.
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; We check this in two ways: by looking for the FMOV inside the loop,
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; and also by checking that we're not spilling any FP callee-saved
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; registers.
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%struct.Node = type { %struct.Node*, i8* }
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define void @process_nodes(%struct.Node* %0) {
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; CHECK-LABEL: process_nodes:
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; CHECK-NOT: stp {{d[0-9]+}}
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; CHECK-LABEL: .LBB0_2:
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; CHECK: fmov s0, #1.00000000
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; CHECK: bl do_it
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entry:
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%1 = icmp eq %struct.Node* %0, null
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br i1 %1, label %exit, label %loop
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loop:
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%2 = phi %struct.Node* [ %4, %loop ], [ %0, %entry ]
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tail call void @do_it(float 1.000000e+00, %struct.Node* nonnull %2)
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%3 = getelementptr inbounds %struct.Node, %struct.Node* %2, i64 0, i32 0
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%4 = load %struct.Node*, %struct.Node** %3, align 8
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%5 = icmp eq %struct.Node* %4, null
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br i1 %5, label %exit, label %loop
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exit:
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ret void
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}
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declare void @do_it(float, %struct.Node*)
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