[Hexagon] New HVX target features.

This patch lets the llvm tools handle the new HVX target features that
are added by frontend (clang). The target-features are of the form
"hvx-length64b" for 64 Byte HVX mode, "hvx-length128b" for 128 Byte mode HVX.
"hvx-double" is an alias to "hvx-length128b" and is soon will be deprecated.
The hvx version target feature is upgated form "+hvx" to "+hvxv{version_number}.
Eg: "+hvxv62"

For the correct HVX code generation, the user must use the following
target features.
For 64B mode: "+hvxv62" "+hvx-length64b"
For 128B mode: "+hvxv62" "+hvx-length128b"

Clang picks a default length if none is specified. If for some reason,
no hvx-length is specified to llvm, the compilation will bail out.
There is a corresponding clang patch.

Differential Revision: https://reviews.llvm.org/D38851

llvm-svn: 316101

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/test/CodeGen/Hexagon/builtin-expect.ll b/llvm/test/CodeGen/Hexagon/builtin-expect.ll
index 9945da1782b..9fed28760ad 100644
--- a/llvm/test/CodeGen/Hexagon/builtin-expect.ll
+++ b/llvm/test/CodeGen/Hexagon/builtin-expect.ll
@@ -39,6 +39,6 @@ b14:                                              ; preds = %b13, %b10
 
 declare i32 @bar(i32) local_unnamed_addr #0
 
-attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvx,-hvx-double,-long-calls" }
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvxv60,+hvx-length64b,-long-calls" }
 
 !0 = !{!"branch_weights", i32 1, i32 2000}