; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; NOTE: The checks for opt are NOT added by the update script. Those
; checks are looking for the absence of specific metadata, which
; cannot be expressed reliably by the generated checks.
; RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck %s -check-prefix=ISA
; RUN: opt --amdgpu-annotate-uniform -S %s | FileCheck %s -check-prefix=UNIFORM
; RUN: opt --amdgpu-annotate-uniform --si-annotate-control-flow -S %s | FileCheck %s -check-prefix=CONTROLFLOW
; This module creates a divergent branch in block Flow2. The branch is
; marked as divergent by the divergence analysis but the condition is
; not. This test ensures that the divergence of the branch is tested,
; not its condition, so that branch is correctly emitted as divergent.
target triple = "amdgcn-mesa-mesa3d"
define amdgpu_ps void @main(i32 %0, float %1) {
; ISA-LABEL: main:
; ISA: ; %bb.0: ; %start
; ISA-NEXT: v_readfirstlane_b32 s0, v0
; ISA-NEXT: s_mov_b32 m0, s0
; ISA-NEXT: s_mov_b32 s8, 0
; ISA-NEXT: v_interp_p1_f32_e32 v0, v1, attr0.x
; ISA-NEXT: v_cmp_nlt_f32_e32 vcc, 0, v0
; ISA-NEXT: s_mov_b64 s[0:1], 0
; ISA-NEXT: ; implicit-def: $sgpr4_sgpr5
; ISA-NEXT: ; implicit-def: $sgpr2_sgpr3
; ISA-NEXT: s_branch .LBB0_3
; ISA-NEXT: .LBB0_1: ; %Flow1
; ISA-NEXT: ; in Loop: Header=BB0_3 Depth=1
; ISA-NEXT: s_or_b64 exec, exec, s[6:7]
; ISA-NEXT: s_add_i32 s8, s8, 1
; ISA-NEXT: s_mov_b64 s[6:7], 0
; ISA-NEXT: .LBB0_2: ; %Flow
; ISA-NEXT: ; in Loop: Header=BB0_3 Depth=1
; ISA-NEXT: s_and_b64 s[10:11], exec, s[4:5]
; ISA-NEXT: s_or_b64 s[0:1], s[10:11], s[0:1]
; ISA-NEXT: s_andn2_b64 s[2:3], s[2:3], exec
; ISA-NEXT: s_and_b64 s[6:7], s[6:7], exec
; ISA-NEXT: s_or_b64 s[2:3], s[2:3], s[6:7]
; ISA-NEXT: s_andn2_b64 exec, exec, s[0:1]
; ISA-NEXT: s_cbranch_execz .LBB0_6
; ISA-NEXT: .LBB0_3: ; %loop
; ISA-NEXT: ; =>This Inner Loop Header: Depth=1
; ISA-NEXT: s_or_b64 s[4:5], s[4:5], exec
; ISA-NEXT: s_cmp_lt_u32 s8, 32
; ISA-NEXT: s_mov_b64 s[6:7], -1
; ISA-NEXT: s_cbranch_scc0 .LBB0_2
; ISA-NEXT: ; %bb.4: ; %endif1
; ISA-NEXT: ; in Loop: Header=BB0_3 Depth=1
; ISA-NEXT: s_mov_b64 s[4:5], -1
; ISA-NEXT: s_and_saveexec_b64 s[6:7], vcc
; ISA-NEXT: s_cbranch_execz .LBB0_1
; ISA-NEXT: ; %bb.5: ; %endif2
; ISA-NEXT: ; in Loop: Header=BB0_3 Depth=1
; ISA-NEXT: s_xor_b64 s[4:5], exec, -1
; ISA-NEXT: s_branch .LBB0_1
; ISA-NEXT: .LBB0_6: ; %Flow2
; ISA-NEXT: s_or_b64 exec, exec, s[0:1]
; ISA-NEXT: v_mov_b32_e32 v1, 0
; ISA-NEXT: s_and_saveexec_b64 s[0:1], s[2:3]
; ISA-NEXT: ; %bb.7: ; %if1
; ISA-NEXT: v_sqrt_f32_e32 v1, v0
; ISA-NEXT: ; %bb.8: ; %endloop
; ISA-NEXT: s_or_b64 exec, exec, s[0:1]
; ISA-NEXT: exp mrt0 v1, v1, v1, v1 done vm
; ISA-NEXT: s_endpgm
start:
%v0 = call float @llvm.amdgcn.interp.p1(float %1, i32 0, i32 0, i32 %0)
br label %loop
loop: ; preds = %Flow, %start
%v1 = phi i32 [ 0, %start ], [ %6, %Flow ]
%v2 = icmp ugt i32 %v1, 31
%2 = xor i1 %v2, true
br i1 %2, label %endif1, label %Flow
Flow1: ; preds = %endif2, %endif1
%3 = phi i32 [ %v5, %endif2 ], [ undef, %endif1 ]
%4 = phi i1 [ false, %endif2 ], [ true, %endif1 ]
br label %Flow
; UNIFORM-LABEL: Flow2:
; UNIFORM-NEXT: br i1 %8, label %if1, label %endloop
; UNIFORM-NOT: !amdgpu.uniform
; UNIFORM: if1:
; CONTROLFLOW-LABEL: Flow2:
; CONTROLFLOW-NEXT: call void @llvm.amdgcn.end.cf.i64(i64 %{{.*}})
; CONTROLFLOW-NEXT: [[IF:%.*]] = call { i1, i64 } @llvm.amdgcn.if.i64(i1 %{{.*}})
; CONTROLFLOW-NEXT: [[COND:%.*]] = extractvalue { i1, i64 } [[IF]], 0
; CONTROLFLOW-NEXT: %{{.*}} = extractvalue { i1, i64 } [[IF]], 1
; CONTROLFLOW-NEXT: br i1 [[COND]], label %if1, label %endloop
Flow2: ; preds = %Flow
br i1 %8, label %if1, label %endloop
if1: ; preds = %Flow2
%v3 = call float @llvm.sqrt.f32(float %v0)
br label %endloop
endif1: ; preds = %loop
%v4 = fcmp ogt float %v0, 0.000000e+00
%5 = xor i1 %v4, true
br i1 %5, label %endif2, label %Flow1
Flow: ; preds = %Flow1, %loop
%6 = phi i32 [ %3, %Flow1 ], [ undef, %loop ]
%7 = phi i1 [ %4, %Flow1 ], [ true, %loop ]
%8 = phi i1 [ false, %Flow1 ], [ true, %loop ]
br i1 %7, label %Flow2, label %loop
endif2: ; preds = %endif1
%v5 = add i32 %v1, 1
br label %Flow1
endloop: ; preds = %if1, %Flow2
%v6 = phi float [ 0.000000e+00, %Flow2 ], [ %v3, %if1 ]
call void @llvm.amdgcn.exp.f32(i32 0, i32 15, float %v6, float %v6, float %v6, float %v6, i1 true, i1 true)
ret void
}
; Function Attrs: nounwind readnone speculatable willreturn
declare float @llvm.sqrt.f32(float) #0
; Function Attrs: nounwind readnone speculatable
declare float @llvm.amdgcn.interp.p1(float, i32 immarg, i32 immarg, i32) #1
; Function Attrs: inaccessiblememonly nounwind writeonly
declare void @llvm.amdgcn.exp.f32(i32 immarg, i32 immarg, float, float, float, float, i1 immarg, i1 immarg) #2
attributes #0 = { nounwind readnone speculatable willreturn }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { inaccessiblememonly nounwind writeonly }