llvm-project/llvm/test/CodeGen/AMDGPU/dead-machine-elim-after-dea...

29 lines
780 B
LLVM

; RUN: llc -march=amdgcn -verify-machineinstrs %s -o - | FileCheck %s
; CHECK-LABEL: foo
; CHECK-NOT: BUFFER_LOAD_DWORDX2_OFFSET
; After dead code elimination, that buffer load should be eliminated finally
; after dead lane detection.
define amdgpu_kernel void @foo() {
entry:
switch i8 undef, label %foo.exit [
i8 4, label %sw.bb4
i8 10, label %sw.bb10
]
sw.bb4:
%x = load i64, i64 addrspace(1)* undef, align 8
%c = sitofp i64 %x to float
%v = insertelement <2 x float> <float undef, float 0.000000e+00>, float %c, i32 0
br label %foo.exit
sw.bb10:
unreachable
foo.exit:
%agg = phi <2 x float> [ %v, %sw.bb4 ], [ zeroinitializer, %entry ]
%s = extractelement <2 x float> %agg, i32 1
store float %s, float addrspace(1)* undef, align 4
ret void
}