When the result of an EXTRACT_SUBREG, INSERT_SUBREG, or SUBREG_TO_REG

operator is used by a CopyToReg to export the value to a different
block, don't reuse the CopyToReg's register for the subreg operation
result if the register isn't precisely the right class for the
subreg operation.

Also, rename the h-registers.ll test, now that there are more
than one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69087 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 48 insertions, 0 deletions

diff --git a/test/CodeGen/X86/h-registers-0.ll b/test/CodeGen/X86/h-registers-0.ll
new file mode 100644
index 0000000000..2777be9cc3
--- /dev/null
+++ b/test/CodeGen/X86/h-registers-0.ll
@@ -0,0 +1,48 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep {movzbl	%\[abcd\]h,} | count 4
+; RUN: llvm-as < %s | llc -march=x86    > %t
+; RUN: grep {incb	%ah} %t | count 3
+; RUN: grep {movzbl	%ah,} %t | count 3
+
+; Use h registers. On x86-64, codegen doesn't support general allocation
+; of h registers yet, due to x86 encoding complications.
+
+define void @bar64(i64 inreg %x, i8* inreg %p) nounwind {
+  %t0 = lshr i64 %x, 8
+  %t1 = trunc i64 %t0 to i8
+  %t2 = add i8 %t1, 1
+  store i8 %t2, i8* %p
+  ret void
+}
+
+define void @bar32(i32 inreg %x, i8* inreg %p) nounwind {
+  %t0 = lshr i32 %x, 8
+  %t1 = trunc i32 %t0 to i8
+  %t2 = add i8 %t1, 1
+  store i8 %t2, i8* %p
+  ret void
+}
+
+define void @bar16(i16 inreg %x, i8* inreg %p) nounwind {
+  %t0 = lshr i16 %x, 8
+  %t1 = trunc i16 %t0 to i8
+  %t2 = add i8 %t1, 1
+  store i8 %t2, i8* %p
+  ret void
+}
+
+define i64 @qux64(i64 inreg %x) nounwind {
+  %t0 = lshr i64 %x, 8
+  %t1 = and i64 %t0, 255
+  ret i64 %t1
+}
+
+define i32 @qux32(i32 inreg %x) nounwind {
+  %t0 = lshr i32 %x, 8
+  %t1 = and i32 %t0, 255
+  ret i32 %t1
+}
+
+define i16 @qux16(i16 inreg %x) nounwind {
+  %t0 = lshr i16 %x, 8
+  ret i16 %t0
+}