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AMDGPU: Change stack alignment

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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.

llvm-svn: 300481
This commit is contained in:
Matt Arsenault 2017-04-17 19:48:24 +00:00
parent ca6976ddbb
commit 931bf20b8a
1 changed files with 4 additions and 2 deletions
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6
lib/Target/AMDGPU/AMDGPUSubtarget.h
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@ -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 {