File: fmov-imm-licm.ll

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llvm-toolchain-19 1%3A19.1.7-3
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; RUN: llc -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s

; The purpose of this test is to check that an FMOV instruction that
; only materializes an immediate is not MachineLICM'd out of a loop.
; We check this in two ways: by looking for the FMOV inside the loop,
; and also by checking that we're not spilling any FP callee-saved
; registers.

%struct.Node = type { ptr, ptr }

define void @process_nodes(ptr %0) {
; CHECK-LABEL: process_nodes:
; CHECK-NOT:   stp {{d[0-9]+}}
; CHECK-LABEL: .LBB0_2:
; CHECK:       fmov s0, #1.00000000
; CHECK:       bl do_it
entry:
  %1 = icmp eq ptr %0, null
  br i1 %1, label %exit, label %loop

loop:
  %2 = phi ptr [ %4, %loop ], [ %0, %entry ]
  tail call void @do_it(float 1.000000e+00, ptr nonnull %2)
  %3 = getelementptr inbounds %struct.Node, ptr %2, i64 0, i32 0
  %4 = load ptr, ptr %3, align 8
  %5 = icmp eq ptr %4, null
  br i1 %5, label %exit, label %loop

exit:
  ret void
}

declare void @do_it(float, ptr)