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Diffstat (limited to 'test/CodeGen/X86/remat-phys-dead.ll')
| -rw-r--r-- | test/CodeGen/X86/remat-phys-dead.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/CodeGen/X86/remat-phys-dead.ll b/test/CodeGen/X86/remat-phys-dead.ll new file mode 100644 index 0000000000..4d7ee622a3 --- /dev/null +++ b/test/CodeGen/X86/remat-phys-dead.ll @@ -0,0 +1,23 @@ +; REQUIRES: asserts +; RUN: llc -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 COALESCING +; CHECK: Remat: %EAX<def,dead> = MOV32r0 %EFLAGS<imp-def,dead>, %AL<imp-def> +} + +; 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 COALESCING +; CHECK: Remat: %EAX<def> = MOV32r0 %EFLAGS<imp-def,dead> +} + |