1 files changed, 70 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/fixup-bw-copy.ll b/llvm/test/CodeGen/X86/fixup-bw-copy.ll
new file mode 100644
index 00000000000..9528253ef5d
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fixup-bw-copy.ll
@@ -0,0 +1,70 @@
+; NOTE: Assertions have been autogenerated by update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -fixup-byte-word-insts=1 -mtriple=x86_64-- < %s | FileCheck --check-prefix=X64 --check-prefix=BWON64 %s
+; RUN: llc -verify-machineinstrs -fixup-byte-word-insts=0 -mtriple=x86_64-- < %s | FileCheck --check-prefix=X64 --check-prefix=BWOFF64 %s
+; RUN: llc -verify-machineinstrs -fixup-byte-word-insts=1 -mtriple=i386-- < %s | FileCheck --check-prefix=X32 --check-prefix=BWON32 %s
+; RUN: llc -verify-machineinstrs -fixup-byte-word-insts=0 -mtriple=i386-- < %s | FileCheck --check-prefix=X32 --check-prefix=BWOFF32 %s
+
+target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
+
+define i8 @test_movb(i8 %a0) {
+; BWON64-LABEL: test_movb:
+; BWON64:       # BB#0:
+; BWON64-NEXT:    movl %edi, %eax
+; BWON64-NEXT:    retq
+;
+; BWOFF64-LABEL: test_movb:
+; BWOFF64:       # BB#0:
+; BWOFF64-NEXT:    movb %dil, %al
+; BWOFF64-NEXT:    retq
+;
+; X32-LABEL: test_movb:
+; X32:       # BB#0:
+; X32-NEXT:    movb {{[0-9]+}}(%esp), %al
+; X32-NEXT:    retl
+  ret i8 %a0
+}
+
+define i16 @test_movw(i16 %a0) {
+; BWON64-LABEL: test_movw:
+; BWON64:       # BB#0:
+; BWON64-NEXT:    movl %edi, %eax
+; BWON64-NEXT:    retq
+;
+; BWOFF64-LABEL: test_movw:
+; BWOFF64:       # BB#0:
+; BWOFF64-NEXT:    movw %di, %ax
+; BWOFF64-NEXT:    retq
+;
+; BWON32-LABEL: test_movw:
+; BWON32:       # BB#0:
+; BWON32-NEXT:    movzwl {{[0-9]+}}(%esp), %eax
+; BWON32-NEXT:    retl
+;
+; BWOFF32-LABEL: test_movw:
+; BWOFF32:       # BB#0:
+; BWOFF32-NEXT:    movw {{[0-9]+}}(%esp), %ax
+; BWOFF32-NEXT:    retl
+  ret i16 %a0
+}
+
+; Verify we don't mess with H-reg copies (only generated in 32-bit mode).
+define i8 @test_movb_hreg(i16 %a0) {
+; X64-LABEL: test_movb_hreg:
+; X64:       # BB#0:
+; X64-NEXT:    movl %edi, %eax
+; X64-NEXT:    shrl $8, %eax
+; X64-NEXT:    addb %dil, %al
+; X64-NEXT:    retq
+;
+; X32-LABEL: test_movb_hreg:
+; X32:       # BB#0:
+; X32-NEXT:    movzwl {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    addb %al, %ah
+; X32-NEXT:    movb %ah, %al
+; X32-NEXT:    retl
+  %tmp0 = trunc i16 %a0 to i8
+  %tmp1 = lshr i16 %a0, 8
+  %tmp2 = trunc i16 %tmp1 to i8
+  %tmp3 = add i8 %tmp0, %tmp2
+  ret i8 %tmp3
+}