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; RUN: opt %s -mtriple amdgcn-- -passes='print<divergence>' -disable-output 2>&1 | FileCheck %s
; NOTE: The new pass manager does not fall back on legacy divergence
; analysis even when the function contains an irreducible loop. The
; (new) divergence analysis conservatively reports all values as
; divergent. This test does not check for this conservative
; behaviour. Instead, it only checks for the values that are known to
; be divergent according to the legacy analysis.
; RUN: opt -mtriple amdgcn-- -passes='print<divergence>' -disable-output %s 2>&1 | FileCheck %s
; This test contains an unstructured loop.
; +-------------- entry ----------------+
; | |
; V V
; i1 = phi(0, i3) i2 = phi(0, i3)
; j1 = i1 + 1 ---> i3 = phi(j1, j2) <--- j2 = i2 + 2
; ^ | ^
; | V |
; +-------- switch (tid / i3) ----------+
; |
; V
; if (i3 == 5) // divergent
; because sync dependent on (tid / i3).
define i32 @unstructured_loop(i1 %entry_cond) {
; CHECK-LABEL: Divergence Analysis' for function 'unstructured_loop'
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
br i1 %entry_cond, label %loop_entry_1, label %loop_entry_2
loop_entry_1:
%i1 = phi i32 [ 0, %entry ], [ %i3, %loop_latch ]
%j1 = add i32 %i1, 1
br label %loop_body
loop_entry_2:
%i2 = phi i32 [ 0, %entry ], [ %i3, %loop_latch ]
%j2 = add i32 %i2, 2
br label %loop_body
loop_body:
%i3 = phi i32 [ %j1, %loop_entry_1 ], [ %j2, %loop_entry_2 ]
br label %loop_latch
loop_latch:
%div = sdiv i32 %tid, %i3
switch i32 %div, label %branch [ i32 1, label %loop_entry_1
i32 2, label %loop_entry_2 ]
branch:
%cmp = icmp eq i32 %i3, 5
br i1 %cmp, label %then, label %else
; CHECK: DIVERGENT: br i1 %cmp,
then:
ret i32 0
else:
ret i32 1
}
declare i32 @llvm.amdgcn.workitem.id.x() #0
attributes #0 = { nounwind readnone }
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