[AMDGPU] Remove FeatureVGPRSpilling

This feature is only relevant to shaders, and is no longer used. When disabled,
lowering of reserved registers for shaders causes a compiler crash.

Remove the feature and add a test for compilation of shaders at OptNone.

Differential Revision: https://reviews.llvm.org/D53829

llvm-svn: 345763

1 files changed, 66 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AMDGPU/noop-shader-O0.ll b/llvm/test/CodeGen/AMDGPU/noop-shader-O0.ll
new file mode 100644
index 00000000000..af47170a4a9
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/noop-shader-O0.ll
@@ -0,0 +1,66 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -O0 -mtriple=amdgcn-amd-amdpal -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+
+; Ensure NOOP shaders compile at OptNone.
+
+; Confirm registers reserved in SIMachineFunctionInfo are those expected during
+; lowering, even when e.g. spilling is required due to being at OptNone.
+
+target datalayout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5"
+target triple = "amdgcn-amd-amdpal"
+
+define amdgpu_vs void @noop_vs() {
+; GCN-LABEL: noop_vs:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_ls void @noop_ls() {
+; GCN-LABEL: noop_ls:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_hs void @noop_hs() {
+; GCN-LABEL: noop_hs:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_es void @noop_es() {
+; GCN-LABEL: noop_es:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_gs void @noop_gs() {
+; GCN-LABEL: noop_gs:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_ps void @noop_ps() {
+; GCN-LABEL: noop_ps:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}
+
+define amdgpu_cs void @noop_cs() {
+; GCN-LABEL: noop_cs:
+; GCN:       ; %bb.0: ; %entry
+; GCN-NEXT:    s_endpgm
+entry:
+  ret void
+}