diff --git a/clang/test/Modules/pch_container.m b/clang/test/Modules/pch_container.m
--- a/clang/test/Modules/pch_container.m
+++ b/clang/test/Modules/pch_container.m
@@ -8,11 +8,11 @@
 
 
 // RUN: llvm-objdump --section-headers %t-MachO/DependsOnModule.pcm %t-ELF/DependsOnModule.pcm %t-COFF/DependsOnModule.pcm | FileCheck %s
-// CHECK: file format Mach-O 64-bit x86-64
+// CHECK: file format mach-o 64-bit x86-64
 // CHECK: __clangast   {{[0-9a-f]+}} {{[0-9a-f]+}} DATA
-// CHECK: file format ELF64-x86-64
+// CHECK: file format elf64-x86-64
 // CHECK: __clangast   {{[0-9a-f]+}} {{[0-9a-f]+}} DATA
-// CHECK: file format COFF-x86-64
+// CHECK: file format coff-x86-64
 // CHECK: clangast   {{[0-9a-f]+}} {{[0-9a-f]+}}
 
 // RUN: not llvm-objdump --section-headers %t-raw/DependsOnModule.pcm
diff --git a/lld/test/COFF/savetemps.ll b/lld/test/COFF/savetemps.ll
--- a/lld/test/COFF/savetemps.ll
+++ b/lld/test/COFF/savetemps.ll
@@ -19,7 +19,7 @@
 ; RUN:     FileCheck --check-prefix=CHECK-OBJDUMP %s
 
 ; CHECK: define i32 @main()
-; CHECK-OBJDUMP: file format COFF
+; CHECK-OBJDUMP: file format coff
 
 target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-pc-windows-msvc"
diff --git a/llvm/test/CodeGen/AArch64/arm64-simplest-elf.ll b/llvm/test/CodeGen/AArch64/arm64-simplest-elf.ll
--- a/llvm/test/CodeGen/AArch64/arm64-simplest-elf.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-simplest-elf.ll
@@ -11,7 +11,7 @@
 
   ; Similarly make sure ELF output works and is vaguely sane: aarch64 target
   ; machine with correct section & symbol names.
-; CHECK-ELF: file format ELF64-aarch64
+; CHECK-ELF: file format elf64-aarch64
 
 ; CHECK-ELF: Disassembly of section .text
 ; CHECK-ELF-LABEL: foo:
diff --git a/llvm/test/CodeGen/ARM/Windows/trivial-gnu-object.ll b/llvm/test/CodeGen/ARM/Windows/trivial-gnu-object.ll
--- a/llvm/test/CodeGen/ARM/Windows/trivial-gnu-object.ll
+++ b/llvm/test/CodeGen/ARM/Windows/trivial-gnu-object.ll
@@ -2,7 +2,7 @@
 ; RUN: llc -mtriple=thumbv7-windows-gnu -filetype=obj -o - %s | llvm-objdump -d - | FileCheck %s
 
 define void @foo() {
-; CHECK: file format COFF-ARM
+; CHECK: file format coff-arm
 
 ; CHECK-LABEL: foo:
 ; CHECK: bx lr
diff --git a/llvm/test/CodeGen/BPF/reloc-btf-2.ll b/llvm/test/CodeGen/BPF/reloc-btf-2.ll
--- a/llvm/test/CodeGen/BPF/reloc-btf-2.ll
+++ b/llvm/test/CodeGen/BPF/reloc-btf-2.ll
@@ -21,7 +21,7 @@
   ret i32 %3, !dbg !24
 }
 
-; CHECK-RELOC: file format ELF64-BPF
+; CHECK-RELOC: file format elf64-bpf
 ; CHECK-RELOC: RELOCATION RECORDS FOR [.BTF]:
 ; CHECK-RELOC: R_BPF_NONE .bss
 ; CHECK-RELOC: R_BPF_NONE g
diff --git a/llvm/test/CodeGen/BPF/reloc-btf.ll b/llvm/test/CodeGen/BPF/reloc-btf.ll
--- a/llvm/test/CodeGen/BPF/reloc-btf.ll
+++ b/llvm/test/CodeGen/BPF/reloc-btf.ll
@@ -6,7 +6,7 @@
   ret i32 0, !dbg !11
 }
 
-; CHECK-RELOC: file format ELF64-BPF
+; CHECK-RELOC: file format elf64-bpf
 ; CHECK-RELOC: RELOCATION RECORDS FOR [.debug_info]:
 ; CHECK-RELOC: R_BPF_64_32 .debug_abbrev
 ; CHECK-RELOC: R_BPF_64_64 .text
diff --git a/llvm/test/CodeGen/BPF/reloc.ll b/llvm/test/CodeGen/BPF/reloc.ll
--- a/llvm/test/CodeGen/BPF/reloc.ll
+++ b/llvm/test/CodeGen/BPF/reloc.ll
@@ -32,7 +32,7 @@
 ; <label>:13                                      ; preds = %10, %0
   ret i32 0
 
-; CHECK-RELOC: file format ELF64-BPF
+; CHECK-RELOC: file format elf64-bpf
 ; CHECK-RELOC: RELOCATION RECORDS FOR [.eh_frame]:
 ; CHECK-RELOC: R_BPF_64_64 events/net/netif_receive_skb
 }
diff --git a/llvm/test/Object/AMDGPU/objdump.s b/llvm/test/Object/AMDGPU/objdump.s
--- a/llvm/test/Object/AMDGPU/objdump.s
+++ b/llvm/test/Object/AMDGPU/objdump.s
@@ -45,7 +45,7 @@
 	v_lshlrev_b32_e32 v7, 2, v7
         s_endpgm
 
-// CHECK:  file format ELF64-amdgpu
+// CHECK:  file format elf64-amdgpu
 // CHECK:  Disassembly of section .text:
 // CHECK:  hello_world:
 // CHECK:  s_mov_b32 m0, 0x10000                                      // 000000000100: BEFC00FF 00010000
diff --git a/llvm/test/Object/X86/objdump-disassembly-inline-relocations.test b/llvm/test/Object/X86/objdump-disassembly-inline-relocations.test
--- a/llvm/test/Object/X86/objdump-disassembly-inline-relocations.test
+++ b/llvm/test/Object/X86/objdump-disassembly-inline-relocations.test
@@ -1,7 +1,7 @@
 # RUN: llvm-objdump -d -r %p/../Inputs/trivial-object-test.coff-i386 \
 # RUN:              | FileCheck %s -check-prefix COFF-i386
 
-# COFF-i386: file format COFF-i386
+# COFF-i386: file format coff-i386
 # COFF-i386: Disassembly of section .text:
 # COFF-i386:        0:       83 ec 0c                                        subl    $12, %esp
 # COFF-i386:        3:       c7 44 24 08 00 00 00 00                         movl    $0, 8(%esp)
@@ -18,7 +18,7 @@
 # RUN: llvm-objdump -d -r %p/../Inputs/trivial-object-test.coff-x86-64 \
 # RUN:              | FileCheck %s -check-prefix COFF-x86-64
 
-# COFF-x86-64: file format COFF-x86-64
+# COFF-x86-64: file format coff-x86-64
 # COFF-x86-64: Disassembly of section .text:
 # COFF-x86-64:        0:       48 83 ec 28                                     subq    $40, %rsp
 # COFF-x86-64:        4:       c7 44 24 24 00 00 00 00                         movl    $0, 36(%rsp)
@@ -35,7 +35,7 @@
 # RUN: llvm-objdump -d -r %p/../Inputs/trivial-object-test.macho-i386 \
 # RUN:              | FileCheck %s -check-prefix MACHO-i386
 
-# MACHO-i386: file format Mach-O 32-bit i386
+# MACHO-i386: file format mach-o 32-bit i386
 # MACHO-i386: Disassembly of section __TEXT,__text:
 # MACHO-i386: _main:
 # MACHO-i386:        0:       83 ec 0c                                        subl    $12, %esp
@@ -53,7 +53,7 @@
 # RUN: llvm-objdump -d -r %p/../Inputs/trivial-object-test.macho-x86-64 \
 # RUN:              | FileCheck %s -check-prefix MACHO-x86-64
 
-# MACHO-x86-64: file format Mach-O 64-bit x86-64
+# MACHO-x86-64: file format mach-o 64-bit x86-64
 # MACHO-x86-64: Disassembly of section __TEXT,__text:
 # MACHO-x86-64: _main:
 # MACHO-x86-64:        0:       48 83 ec 08                                     subq    $8, %rsp
@@ -72,7 +72,7 @@
 # RUN: yaml2obj --docnum=1 %s -o %t.elf-i386
 # RUN: llvm-objdump -d -r %t.elf-i386 | FileCheck %s -check-prefix ELF-i386
 
-# ELF-i386: file format ELF32-i386
+# ELF-i386: file format elf32-i386
 # ELF-i386: Disassembly of section .text:
 # ELF-i386: main:
 # ELF-i386:        0:     83 ec 0c                                        subl    $12, %esp
@@ -170,7 +170,7 @@
   - Name:    puts
     Binding: STB_GLOBAL
 
-# ELF-x86-64: file format ELF64-x86-64
+# ELF-x86-64: file format elf64-x86-64
 # ELF-x86-64: Disassembly of section .text:
 # ELF-x86-64: main:
 # ELF-x86-64:        0:   48 83 ec 08                                     subq    $8, %rsp
diff --git a/llvm/test/Object/X86/objdump-label.test b/llvm/test/Object/X86/objdump-label.test
--- a/llvm/test/Object/X86/objdump-label.test
+++ b/llvm/test/Object/X86/objdump-label.test
@@ -1,7 +1,7 @@
 RUN: llvm-objdump -d %p/../Inputs/trivial-label-test.elf-x86-64 \
 RUN:              | FileCheck %s -check-prefix ELF-x86-64
 
-ELF-x86-64: file format ELF64-x86-64
+ELF-x86-64: file format elf64-x86-64
 ELF-x86-64: Disassembly of section .text:
 ELF-x86-64: foo:
 ELF-x86-64:        0:	90                                           	nop
diff --git a/llvm/test/Object/X86/objdump-trivial-object.test b/llvm/test/Object/X86/objdump-trivial-object.test
--- a/llvm/test/Object/X86/objdump-trivial-object.test
+++ b/llvm/test/Object/X86/objdump-trivial-object.test
@@ -1,7 +1,7 @@
 # RUN: llvm-objdump -d %p/../Inputs/trivial-object-test.coff-i386 \
 # RUN:              | FileCheck %s -check-prefix COFF-i386
 
-# COFF-i386: file format COFF-i386
+# COFF-i386: file format coff-i386
 # COFF-i386: Disassembly of section .text:
 # COFF-i386:        0:  83 ec 0c                      subl    $12, %esp
 # COFF-i386:        3:  c7 44 24 08 00 00 00 00       movl    $0, 8(%esp)
@@ -15,7 +15,7 @@
 # RUN: llvm-objdump -d %p/../Inputs/trivial-object-test.coff-x86-64 \
 # RUN:              | FileCheck %s -check-prefix COFF-x86-64
 
-# COFF-x86-64: file format COFF-x86-64
+# COFF-x86-64: file format coff-x86-64
 # COFF-x86-64: Disassembly of section .text:
 # COFF-x86-64:        0: 48 83 ec 28                  subq    $40, %rsp
 # COFF-x86-64:        4: c7 44 24 24 00 00 00 00      movl    $0, 36(%rsp)
@@ -29,7 +29,7 @@
 # RUN: yaml2obj --docnum=1 %s -o %t.elf-i386
 # RUN: llvm-objdump -d %t.elf-i386 | FileCheck %s -check-prefix ELF-i386
 
-# ELF-i386: file format ELF32-i386
+# ELF-i386: file format elf32-i386
 # ELF-i386: Disassembly of section .text:
 # ELF-i386:        0: 83 ec 0c                        subl    $12, %esp
 # ELF-i386:        3: c7 44 24 08 00 00 00 00         movl    $0, 8(%esp)
@@ -55,7 +55,7 @@
 # RUN: yaml2obj --docnum=2 %s -o %t.elf-x86-64
 # RUN: llvm-objdump -d %t.elf-x86-64 | FileCheck %s -check-prefix ELF-x86-64
 
-# ELF-x86-64: file format ELF64-x86-64
+# ELF-x86-64: file format elf64-x86-64
 # ELF-x86-64: Disassembly of section .text:
 # ELF-x86-64:        0: 48 83 ec 08                   subq    $8, %rsp
 # ELF-x86-64:        4: c7 44 24 04 00 00 00 00       movl    $0, 4(%rsp)
diff --git a/llvm/test/Object/dynamic-reloc.test b/llvm/test/Object/dynamic-reloc.test
--- a/llvm/test/Object/dynamic-reloc.test
+++ b/llvm/test/Object/dynamic-reloc.test
@@ -8,5 +8,5 @@
 
 RUN: llvm-objdump -r %p/Inputs/dynamic-reloc.so | FileCheck --check-prefix=OBJDUMP %s
 
-OBJDUMP: file format ELF64-x86-64
+OBJDUMP: file format elf64-x86-64
 OBJDUMP-NOT: RELOCATION
diff --git a/llvm/test/Object/objdump-symbol-table.test b/llvm/test/Object/objdump-symbol-table.test
--- a/llvm/test/Object/objdump-symbol-table.test
+++ b/llvm/test/Object/objdump-symbol-table.test
@@ -68,7 +68,7 @@
 # RUN: llvm-objdump -t %p/Inputs/trivial-object-test.macho-i386 \
 # RUN:              | FileCheck %s -check-prefix macho-i386
 
-# macho-i386: trivial-object-test.macho-i386:        file format Mach-O 32-bit i386
+# macho-i386: trivial-object-test.macho-i386:        file format mach-o 32-bit i386
 # macho-i386: SYMBOL TABLE:
 # macho-i386: 00000000 g     F __TEXT,__text  _main
 # macho-i386: 00000000         *UND*          _SomeOtherFunction
diff --git a/llvm/test/tools/llvm-objdump/X86/disassemble-section-name.s b/llvm/test/tools/llvm-objdump/X86/disassemble-section-name.s
--- a/llvm/test/tools/llvm-objdump/X86/disassemble-section-name.s
+++ b/llvm/test/tools/llvm-objdump/X86/disassemble-section-name.s
@@ -1,7 +1,7 @@
 # RUN: yaml2obj %p/Inputs/simple-executable-x86_64.yaml -o %t
 # RUN: llvm-objdump -d %t | FileCheck %s
 
-# CHECK:       :      file format ELF64-x86-64
+# CHECK:       :      file format elf64-x86-64
 # CHECK-EMPTY:
 # CHECK-EMPTY:
 # CHECK-NEXT:  Disassembly of section .text:
diff --git a/llvm/test/tools/llvm-objdump/X86/elf-disassemble-symbol-labels-exec.test b/llvm/test/tools/llvm-objdump/X86/elf-disassemble-symbol-labels-exec.test
--- a/llvm/test/tools/llvm-objdump/X86/elf-disassemble-symbol-labels-exec.test
+++ b/llvm/test/tools/llvm-objdump/X86/elf-disassemble-symbol-labels-exec.test
@@ -7,7 +7,7 @@
 # RUN:                                   --implicit-check-not=other
 
 # Match this line so the implicit check-nots don't match the path.
-# CHECK: {{^.*}}file format ELF64-x86-64
+# CHECK: {{^.*}}file format elf64-x86-64
 
 # CHECK:     0000000000004000 first:
 # CHECK:     0000000000004001 second:
diff --git a/llvm/test/tools/llvm-objdump/X86/elf-dynamic-relocs.test b/llvm/test/tools/llvm-objdump/X86/elf-dynamic-relocs.test
--- a/llvm/test/tools/llvm-objdump/X86/elf-dynamic-relocs.test
+++ b/llvm/test/tools/llvm-objdump/X86/elf-dynamic-relocs.test
@@ -6,7 +6,7 @@
 # RUN: llvm-objdump --dynamic-reloc %t | FileCheck --implicit-check-not=R_X86 %s
 # RUN: llvm-objdump -R %t | FileCheck --implicit-check-not=R_X86 %s
 
-# CHECK:      file format ELF64-x86-64
+# CHECK:      file format elf64-x86-64
 # CHECK:      DYNAMIC RELOCATION RECORDS
 # CHECK-NEXT: 0000000000000000 R_X86_64_RELATIVE *ABS*
 # CHECK-NEXT: 0000000000000000 R_X86_64_JUMP_SLOT bar
diff --git a/llvm/test/tools/llvm-objdump/X86/output-ordering.test b/llvm/test/tools/llvm-objdump/X86/output-ordering.test
--- a/llvm/test/tools/llvm-objdump/X86/output-ordering.test
+++ b/llvm/test/tools/llvm-objdump/X86/output-ordering.test
@@ -10,7 +10,7 @@
 ## --reloc, so we test them independently.
 
 ## File headers (-f)
-# CHECK: file format ELF64-x86-64
+# CHECK: file format elf64-x86-64
 # CHECK: architecture: x86_64
 # CHECK: start address: 0x0000000000000000
 ## Private headers (-p)
diff --git a/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test b/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
--- a/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
+++ b/llvm/test/tools/llvm-objdump/X86/warn-missing-disasm-func.test
@@ -15,7 +15,7 @@
 
 # CHECK: warning: {{.*}}: failed to disassemble missing function foo
 
-# MULTI: file format ELF64-x86-64
+# MULTI: file format elf64-x86-64
 # MULTI: warning: {{.*}}: failed to disassemble missing function foo
-# MULTI: file format ELF64-x86-64
+# MULTI: file format elf64-x86-64
 # MULTI: warning: {{.*}}: failed to disassemble missing function foo
diff --git a/llvm/test/tools/llvm-objdump/all-headers.test b/llvm/test/tools/llvm-objdump/all-headers.test
--- a/llvm/test/tools/llvm-objdump/all-headers.test
+++ b/llvm/test/tools/llvm-objdump/all-headers.test
@@ -6,7 +6,7 @@
 ## --section-headers --private-headers --reloc --syms (-afhprt). Test for them
 ## in the following order which provides GNU objdump compatability.
 
-# CHECK:       file format ELF64-x86-64
+# CHECK:       file format elf64-x86-64
 # CHECK-EMPTY:
 # CHECK-NEXT:  architecture: x86_64
 # CHECK-NEXT:  start address: 0x0000000000000000
@@ -25,7 +25,7 @@
 # RUN: llvm-ar rcs %t.a %t %t2
 # RUN: llvm-objdump --all-headers %t.a | FileCheck %s --check-prefix=ARCHIVE
 
-# ARCHIVE: {{.*}}.a({{.*}}):   file format ELF64-x86-64
+# ARCHIVE: {{.*}}.a({{.*}}):   file format elf64-x86-64
 # ARCHIVE: rw-r--r--
 # ARCHIVE: architecture: x86_64
 # ARCHIVE: start address: 0x0000000000000000
@@ -34,7 +34,7 @@
 # ARCHIVE: Sections:
 # ARCHIVE: SYMBOL TABLE:
 # ARCHIVE: RELOCATION RECORDS FOR [.text]:
-# ARCHIVE: {{.*}}.a({{.*}}2):   file format ELF64-x86-64
+# ARCHIVE: {{.*}}.a({{.*}}2):   file format elf64-x86-64
 # ARCHIVE: rw-r--r--
 # ARCHIVE: architecture: x86_64
 # ARCHIVE: start address: 0x0000000000000000
diff --git a/llvm/test/tools/llvm-objdump/archive-headers.test b/llvm/test/tools/llvm-objdump/archive-headers.test
--- a/llvm/test/tools/llvm-objdump/archive-headers.test
+++ b/llvm/test/tools/llvm-objdump/archive-headers.test
@@ -1,21 +1,21 @@
 # RUN: llvm-objdump -a %p/Inputs/liblong_filenames.a | FileCheck %s
 # RUN: llvm-objdump -archive-headers %p/Inputs/liblong_filenames.a | FileCheck %s
 
-# CHECK: {{.*}}liblong_filenames.a(1.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(1.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200  1416 {{.*}} 1.o
-# CHECK: {{.*}}liblong_filenames.a(2.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(2.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200  1224 {{.*}} 2.o
-# CHECK: {{.*}}liblong_filenames.a(3.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(3.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200  1312 {{.*}} 3.o
-# CHECK: {{.*}}liblong_filenames.a(4.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(4.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200   957 {{.*}} 4.o
-# CHECK: {{.*}}liblong_filenames.a(5.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(5.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200   951 {{.*}} 5.o
-# CHECK: {{.*}}liblong_filenames.a(6.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(6.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200   951 {{.*}} 6.o
-# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopqrstuvwxyz1.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopqrstuvwxyz1.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200   977 {{.*}} abcdefghijklmnopqrstuvwxyz1.o
-# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopqrstuvwxyz2.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopqrstuvwxyz2.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200  1272 {{.*}} abcdefghijklmnopqrstuvwxyz2.o
-# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopq.o): file format ELF64-x86-64
+# CHECK: {{.*}}liblong_filenames.a(abcdefghijklmnopq.o): file format elf64-x86-64
 # CHECK: rw-r--r-- 204299/200   977 {{.*}} abcdefghijklmnopq.o
diff --git a/llvm/test/tools/llvm-objdump/file-headers-coff.test b/llvm/test/tools/llvm-objdump/file-headers-coff.test
--- a/llvm/test/tools/llvm-objdump/file-headers-coff.test
+++ b/llvm/test/tools/llvm-objdump/file-headers-coff.test
@@ -9,6 +9,6 @@
 sections:
 symbols:
 
-# CHECK: [[FILE]]: file format COFF-i386
+# CHECK: [[FILE]]: file format coff-i386
 # CHECK: architecture: i386
 # CHECK: start address: 0x00000000
diff --git a/llvm/test/tools/llvm-objdump/file-headers-elf.test b/llvm/test/tools/llvm-objdump/file-headers-elf.test
--- a/llvm/test/tools/llvm-objdump/file-headers-elf.test
+++ b/llvm/test/tools/llvm-objdump/file-headers-elf.test
@@ -10,7 +10,7 @@
   Machine:         EM_X86_64
   Entry:           0x123456789abcde
 
-# ELF64: [[FILE]]: file format ELF64-x86-64
+# ELF64: [[FILE]]: file format elf64-x86-64
 # ELF64: architecture: x86_64
 # ELF64: start address: 0x00123456789abcde
 
@@ -18,7 +18,7 @@
 # RUN: llvm-objdump -f %t-i386 | FileCheck -DFILE=%t-i386 %s -check-prefix ELF32
 # RUN: llvm-objdump -file-headers %t-i386 | FileCheck %s -DFILE=%t-i386 -check-prefix ELF32
 
-# ELF32: [[FILE]]: file format ELF32-i386
+# ELF32: [[FILE]]: file format elf32-i386
 # ELF32: architecture: i386
 # ELF32: start address: 0x12345678
 
diff --git a/llvm/test/tools/llvm-objdump/non-archive-object.test b/llvm/test/tools/llvm-objdump/non-archive-object.test
--- a/llvm/test/tools/llvm-objdump/non-archive-object.test
+++ b/llvm/test/tools/llvm-objdump/non-archive-object.test
@@ -2,7 +2,7 @@
 # RUN: llvm-objdump -a %t | FileCheck %s
 
 # If this test has not crashed, then this test passed.
-# CHECK: file format ELF64-x86-64
+# CHECK: file format elf64-x86-64
 
 !ELF
 FileHeader:
diff --git a/llvm/test/tools/llvm-objdump/relocations-in-nonreloc.test b/llvm/test/tools/llvm-objdump/relocations-in-nonreloc.test
--- a/llvm/test/tools/llvm-objdump/relocations-in-nonreloc.test
+++ b/llvm/test/tools/llvm-objdump/relocations-in-nonreloc.test
@@ -7,7 +7,7 @@
 # RUN: yaml2obj --docnum=3 %s -o %t3
 # RUN: llvm-objdump -r %t3 | FileCheck %s -DFILE=%t3 --check-prefixes=FMT,REL --implicit-check-not={{.}}
 
-# FMT: [[FILE]]: file format ELF64-x86-64
+# FMT: [[FILE]]: file format elf64-x86-64
 
 # REL:      RELOCATION RECORDS FOR []:
 # REL-NEXT: OFFSET           TYPE                     VALUE
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -2168,7 +2168,7 @@
       outs() << A->getFileName() << "(" << O->getFileName() << ")";
     else
       outs() << O->getFileName();
-    outs() << ":\tfile format " << O->getFileFormatName() << "\n\n";
+    outs() << ":\tfile format " << O->getFileFormatName().lower() << "\n\n";
   }
 
   if (StartAddress.getNumOccurrences() || StopAddress.getNumOccurrences())