AMDGPU: Fix kernel argument alignment impacting stack size

Don't use AllocateStack because kernel arguments have nothing
to do with the stack. The ensureMaxAlignment call was still
changing the stack alignment.

llvm-svn: 273080

1 files changed, 44 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AMDGPU/kernarg-stack-alignment.ll b/llvm/test/CodeGen/AMDGPU/kernarg-stack-alignment.ll
new file mode 100644
index 00000000000..21c92dbc909
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/kernarg-stack-alignment.ll
@@ -0,0 +1,44 @@
+; RUN: llc -O0 -march=amdgcn -verify-machineinstrs < %s | FileCheck %s
+
+; Test that the alignment of kernel arguments does not impact the
+; alignment of the stack
+
+; CHECK-LABEL: {{^}}no_args:
+; CHECK: ScratchSize: 8{{$}}
+define void @no_args() {
+  %alloca = alloca i8
+  store volatile i8 0, i8* %alloca
+  ret void
+}
+
+; CHECK-LABEL: {{^}}force_align32:
+; CHECK: ScratchSize: 8{{$}}
+define void @force_align32(<8 x i32>) {
+  %alloca = alloca i8
+  store volatile i8 0, i8* %alloca
+  ret void
+}
+
+; CHECK-LABEL: {{^}}force_align64:
+; CHECK: ScratchSize: 8{{$}}
+define void @force_align64(<16 x i32>) {
+  %alloca = alloca i8
+  store volatile i8 0, i8* %alloca
+  ret void
+}
+
+; CHECK-LABEL: {{^}}force_align128:
+; CHECK: ScratchSize: 8{{$}}
+define void @force_align128(<32 x i32>) {
+  %alloca = alloca i8
+  store volatile i8 0, i8* %alloca
+  ret void
+}
+
+; CHECK-LABEL: {{^}}force_align256:
+; CHECK: ScratchSize: 8{{$}}
+define void @force_align256(<64 x i32>) {
+  %alloca = alloca i8
+  store volatile i8 0, i8* %alloca
+  ret void
+}