From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Mon, 17 Apr 2017 19:48:24 +0000 (+0000)
Subject: AMDGPU: Change stack alignment
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=fc3524b1a2d2898de82f671fced3b99e34183b55;p=llvm

AMDGPU: Change stack alignment

While the incoming stack for a kernel is 256-byte aligned,
this refers to the base address of the entire wave. This isn't
useful information for most of codegen. Fixes unnecessarily
aligning stack objects in callees.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300481 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AMDGPU/AMDGPUSubtarget.h b/lib/Target/AMDGPU/AMDGPUSubtarget.h
index 36bc2498781..a5cda817ac1 100644
--- a/lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ b/lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -415,9 +415,11 @@ public:
     return 0;
   }
 
+  // Scratch is allocated in 256 dword per wave blocks for the entire
+  // wavefront. When viewed from the perspecive of an arbitrary workitem, this
+  // is 4-byte aligned.
   unsigned getStackAlignment() const {
-    // Scratch is allocated in 256 dword per wave blocks.
-    return 4 * 256 / getWavefrontSize();
+    return 4;
   }
 
   bool enableMachineScheduler() const override {