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| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -codegenprepare -S < %s | FileCheck %s
; Check the idiomatic guard pattern to ensure it's lowered correctly.
define void @test_guard(i1 %cond_0) {
; CHECK-LABEL: @test_guard(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND_0:%.*]], label [[GUARDED:%.*]], label [[DEOPT:%.*]]
; CHECK: deopt:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: ret void
; CHECK: guarded:
; CHECK-NEXT: ret void
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %guarded, label %deopt
deopt: ; preds = %entry
call void @foo()
ret void
guarded:
ret void
}
;; Test a non-guard fastpath/slowpath case
define void @test_triangle(i1 %cond_0) {
; CHECK-LABEL: @test_triangle(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[COND_0:%.*]], label [[FASTPATH:%.*]], label [[SLOWPATH:%.*]]
; CHECK: fastpath:
; CHECK-NEXT: call void @bar()
; CHECK-NEXT: br label [[MERGE:%.*]]
; CHECK: slowpath:
; CHECK-NEXT: call void @foo()
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: ret void
;
entry:
%widenable_cond = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %widenable_cond
br i1 %exiplicit_guard_cond, label %fastpath, label %slowpath
fastpath:
call void @bar()
br label %merge
slowpath:
call void @foo()
br label %merge
merge:
ret void
}
; Demonstrate that resulting CFG simplifications are made
define void @test_cfg_simplify() {
; CHECK-LABEL: @test_cfg_simplify(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret void
;
entry:
%widenable_cond3 = call i1 @llvm.experimental.widenable.condition()
br i1 %widenable_cond3, label %guarded2, label %deopt3
deopt3:
call void @foo()
ret void
guarded2:
%widenable_cond4 = call i1 @llvm.experimental.widenable.condition()
br i1 %widenable_cond4, label %merge1, label %slowpath1
slowpath1:
call void @foo()
br label %merge1
merge1:
ret void
}
declare void @foo()
declare void @bar()
; Function Attrs: inaccessiblememonly nounwind
declare i1 @llvm.experimental.widenable.condition() #0
attributes #0 = { inaccessiblememonly nounwind }
|