File: remat-phys-dead.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; REQUIRES: asserts
; RUN: llc -verify-machineinstrs -mtriple=x86_64-apple-darwin -debug -o /dev/null < %s 2>&1 | FileCheck %s

; We need to make sure that rematerialization into a physical register marks the
; super- or sub-register as dead after this rematerialization since only the
; original register is actually used later. Largely irrelevant for a trivial
; example like this, since eax is never used again, but easy to test.

define i8 @test_remat() {
  ret i8 0
; CHECK: REGISTER COALESCER
; CHECK: Remat: dead $eax = MOV32r0 implicit-def dead $eflags, implicit-def $al
}

; On the other hand, if it's already the correct width, we really shouldn't be
; marking the definition register as dead.

define i32 @test_remat32() {
  ret i32 0
; CHECK: REGISTER COALESCER
; CHECK: Remat: $eax = MOV32r0 implicit-def dead $eflags
}