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When we're rematerializing into a not-quite-right register we already add the real definition as an imp-def, but we should also be marking the "official" register as dead, since nothing else is going to use it as a result of this remat. Not doing this can affect pressure tracking. rdar://problem/14158833 llvm-svn: 184002
24 lines
812 B
LLVM
24 lines
812 B
LLVM
; REQUIRES: asserts
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; RUN: llc -mtriple=x86_64-apple-darwin -debug -o /dev/null < %s 2>&1 | FileCheck %s
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; We need to make sure that rematerialization into a physical register marks the
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; super- or sub-register as dead after this rematerialization since only the
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; original register is actually used later. Largely irrelevant for a trivial
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; example like this, since EAX is never used again, but easy to test.
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define i8 @test_remat() {
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ret i8 0
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; CHECK: REGISTER COALESCING
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; CHECK: Remat: %EAX<def,dead> = MOV32r0 %EFLAGS<imp-def,dead>, %AL<imp-def>
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}
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; On the other hand, if it's already the correct width, we really shouldn't be
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; marking the definition register as dead.
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define i32 @test_remat32() {
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ret i32 0
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; CHECK: REGISTER COALESCING
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; CHECK: Remat: %EAX<def> = MOV32r0 %EFLAGS<imp-def,dead>
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}
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