1+ # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
12# Ensure that loads into FAKE_USEs are correctly removed by the
23# remove-loads-into-fake-uses pass.
3- # RUN: llc -run-pass remove-loads-into-fake-uses -mtriple=x86_64-unknown-linux -debug-only=remove-loads-into-fake-uses 2>&1 -o - %s | FileCheck %s --implicit-check-not=DELETING
4+ # RUN: llc -run-pass remove-loads-into-fake-uses -mtriple=x86_64-unknown-linux -debug-only=remove-loads-into-fake-uses 2>&1 -o - %s | FileCheck %s
45# REQUIRES: asserts
56#
6- # # We ensure that the load into the FAKE_USE is removed, along with the FAKE_USE
7- # # itself, even when the FAKE_USE is for a subregister of the move, and that we
8- # # correctly handle situations where FAKE_USE has additional `killed` operands
9- # # added by other passes.
10-
11- # CHECK: DELETING: renamable $rax = MOV64rm $rbp
12- # CHECK: DELETING: FAKE_USE renamable $eax
13-
14- # # Also verify that the store to the stack slot still exists.
15-
16- # CHECK-LABEL: bb.0:
17- # CHECK: MOV64mr $rbp, 1, $noreg, -48, $noreg, killed renamable $rax :: (store (s64) into %stack.0)
18-
19- # # Finally, verify that when the register has a use between the restore and the
20- # # FAKE_USE, we do not delete the load or fake use.
21-
22- # CHECK: renamable $r11 = MOV64rm $rbp, 1, $noreg, -40, $noreg :: (load (s64) from %stack.1)
23- # CHECK: renamable $r12d = XOR32rr $r12d, $r11d, implicit-def dead $eflags
24- # CHECK: FAKE_USE killed renamable $r11d
7+ # # We verify that:
8+ # # - The load into the FAKE_USE is removed, along with the FAKE_USE itself,
9+ # # even when the FAKE_USE is for a subregister of the move.
10+ # # - We correctly handle situations where FAKE_USE has additional `killed`
11+ # # operands added by other passes.
12+ # # - The store to the stack slot still exists.
13+ # # - When the register has a use between the restore and the FAKE_USE, we do
14+ # # not delete the load or fake use.
2515
2616
2717---
@@ -39,16 +29,45 @@ liveins:
3929frameInfo :
4030 isCalleeSavedInfoValid : true
4131stack :
42- - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
43- stack-id : default, callee-saved-register: '', callee-saved-restored: true,
32+ - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
33+ stack-id : default, callee-saved-register: '', callee-saved-restored: true,
4434 debug-info-variable : ' ' , debug-info-expression: '', debug-info-location: '' }
45- - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
46- stack-id : default, callee-saved-register: '', callee-saved-restored: true,
35+ - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
36+ stack-id : default, callee-saved-register: '', callee-saved-restored: true,
4737 debug-info-variable : ' ' , debug-info-expression: '', debug-info-location: '' }
4838body : |
4939 bb.0:
5040 liveins: $esi, $rdi, $rdx, $r15, $r14, $r13, $r12, $r11, $rbx
5141
42+ ; CHECK-LABEL: name: _ZN1g1jEv
43+ ; CHECK: liveins: $esi, $rdi, $rdx, $r15, $r14, $r13, $r12, $r11, $rbx
44+ ; CHECK-NEXT: {{ $}}
45+ ; CHECK-NEXT: $rbx = MOV64rr $rdx
46+ ; CHECK-NEXT: $r14d = MOV32rr $esi
47+ ; CHECK-NEXT: $r15 = MOV64rr $rdi
48+ ; CHECK-NEXT: renamable $r12d = XOR32rr undef $r12d, undef $r12d, implicit-def dead $eflags, implicit-def $r12
49+ ; CHECK-NEXT: renamable $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $rax
50+
51+ ;; The store to the stack slot is still present.
52+ ; CHECK-NEXT: MOV64mr $rbp, 1, $noreg, -48, $noreg, killed renamable $rax :: (store (s64) into %stack.0)
53+
54+ ; CHECK-NEXT: MOV64mr $rbp, 1, $noreg, -40, $noreg, killed renamable $r11 :: (store (s64) into %stack.1)
55+ ; CHECK-NEXT: renamable $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags
56+ ; CHECK-NEXT: $r13d = MOV32rr killed $eax
57+ ; CHECK-NEXT: $rdi = MOV64rr $r15
58+ ; CHECK-NEXT: CALL64r renamable $r12, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
59+ ; CHECK-NEXT: dead renamable $eax = MOV32rm renamable $rbx, 1, $noreg, 0, $noreg
60+ ; CHECK-NEXT: renamable $eax = MOV32ri 1
61+ ; CHECK-NEXT: TEST8ri renamable $r14b, 1, implicit-def $eflags
62+
63+ ;; First FAKE_USE and its corresponding load are removed; second FAKE_USE of
64+ ;; a restored value that is also used is preserved.
65+ ; CHECK-NEXT: renamable $r11 = MOV64rm $rbp, 1, $noreg, -40, $noreg :: (load (s64) from %stack.1)
66+ ; CHECK-NEXT: renamable $r12d = XOR32rr $r12d, $r11d, implicit-def dead $eflags
67+ ; CHECK-NEXT: FAKE_USE killed renamable $r11d
68+
69+ ; CHECK-NEXT: TEST32rr killed renamable $r13d, renamable $r13d, implicit-def $eflags
70+ ; CHECK-NEXT: RET64
5271 $rbx = MOV64rr $rdx
5372 $r14d = MOV32rr $esi
5473 $r15 = MOV64rr $rdi
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