llvm/test/CodeGen/MIR/X86/inline-asm-foldable.mir

# RUN: llc -mtriple=x86_64 -run-pass=none -o - %s | FileCheck %s

# A register operand marked foldable (from an "rm" constraint) may be folded
# to a stack slot by the register allocator. Check that the marker survives a
# print/parse round trip, whether it was written symbolically (with or without
# a register class) or as part of a numeric flag, and that a tied use, whose
# matched operand number shares the marker's bits, never prints it.

---
name: foldable
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $rdi, $rsi, $edx

    ; CHECK-LABEL: name: foldable
    ; CHECK: INLINEASM &"", attdialect, regdef:GR64 foldable, def %3, regdef-ec:GR64 foldable, def early-clobber %4, regdef:GR64, def %5, regdef foldable, def %6, reguse:GR64 foldable, %0, reguse:GR32 foldable, %2, reguse foldable, %0, reguse tiedto:$0, %1(tied-def 3)
    %0:gr64 = COPY $rdi
    %1:gr64 = COPY $rsi
    %2:gr32 = COPY $edx
    INLINEASM &"", attdialect, regdef:GR64 foldable, def %3:gr64, regdef-ec:GR64 foldable, def early-clobber %4:gr64, regdef:GR64, def %5:gr64, regdef foldable, def %6:gr64, reguse:GR64 foldable, %0, 1076101129 /* reguse:GR32 foldable */, %2, reguse foldable, %0, reguse tiedto:$0, %1(tied-def 3)
    RET64
...