Index: test/CodeGen/NVPTX/MachineSink-convergent.ll =================================================================== --- /dev/null +++ test/CodeGen/NVPTX/MachineSink-convergent.ll @@ -0,0 +1,23 @@ +; RUN: llc < %s | FileCheck %s +target triple = "nvptx64-nvidia-cuda" + +declare void @llvm.cuda.syncthreads() + +; Load a value, then syncthreads. Branch, and use the loaded value only on one +; side of the branch. The load shouldn't be sunk beneath the call, because +; syncthreads is modeled as maystore. +define i32 @f(i32 %x, i32* %ptr, i1 %cond) { +Start: + ; CHECK: ld.u32 + %ptr_val = load i32, i32* %ptr + ; CHECK: bar.sync + call void @llvm.cuda.syncthreads() + br i1 %cond, label %L1, label %L2 +L1: + %ptr_val2 = add i32 %ptr_val, 100 + br label %L2 +L2: + %v4 = phi i32 [ %x, %Start ], [ %ptr_val2, %L1 ] + %v5 = add i32 %v4, 1000 + ret i32 %v5 +}