diff options
Diffstat (limited to 'llvm/test/CodeGen/AMDGPU/branch-relax-bundle.ll')
| -rw-r--r-- | llvm/test/CodeGen/AMDGPU/branch-relax-bundle.ll | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AMDGPU/branch-relax-bundle.ll b/llvm/test/CodeGen/AMDGPU/branch-relax-bundle.ll new file mode 100644 index 00000000000..9f0b8d3553e --- /dev/null +++ b/llvm/test/CodeGen/AMDGPU/branch-relax-bundle.ll @@ -0,0 +1,53 @@ +; RUN: llc -march=amdgcn -mcpu=tahiti -verify-machineinstrs -amdgpu-s-branch-bits=5 < %s | FileCheck -check-prefix=GCN %s + +; Restrict maximum branch to between +15 and -16 dwords + +; Instructions inside a bundle were collectively counted as +; 0-bytes. Make sure this is accounted for when estimating branch +; distances + +; Bundle used for address in call sequence: 20 bytes +; s_getpc_b64 +; s_add_u32 +; s_addc_u32 + +; plus additional overhead +; s_setpc_b64 +; and some register copies + +declare void @func() #0 + +; GCN-LABEL: {{^}}bundle_size: +; GCN: s_cbranch_scc0 [[BB_EXPANSION:BB[0-9]+_[0-9]+]] +; GCN: s_getpc_b64 +; GCN-NEXT: s_add_u32 +; GCN-NEXT: s_addc_u32 +; GCN-NEXT: s_setpc_b64 + +; GCN: {{^}}[[BB_EXPANSION]]: +; GCN: s_getpc_b64 +; GCN: s_add_u32 s{{[0-9]+}}, s{{[0-9]+}}, func@ +; GCN: s_addc_u32 s{{[0-9]+}}, s{{[0-9]+}}, func@ +; GCN: s_swappc_b64 +define amdgpu_kernel void @bundle_size(i32 addrspace(1)* %arg, i32 %cnd) #0 { +bb: + %cmp = icmp eq i32 %cnd, 0 + br i1 %cmp, label %bb3, label %bb2 ; +8 dword branch + +bb2: + call void @func() + call void asm sideeffect + "v_nop_e64 + v_nop_e64 + v_nop_e64 + v_nop_e64 + v_nop_e64", ""() #0 + br label %bb3 + +bb3: + store volatile i32 %cnd, i32 addrspace(1)* %arg + ret void +} + +attributes #0 = { nounwind } +attributes #1 = { nounwind readnone } |
