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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=sccp,loop-deletion,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
declare double @sqrt(double) readnone nounwind willreturn
%empty = type {}
declare %empty @has_side_effects()
; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the
; optimizer to delete this loop.
define double @test_0(i32 %param) {
; CHECK-LABEL: @test_0(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret double 1.000000e+00
;
entry:
br label %Loop
Loop: ; preds = %Loop, %entry
%I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ]
%V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ]
%V2 = call double @sqrt( double %V )
%I3 = add i32 %I2, 1
%tmp.7 = icmp ne i32 %I3, %param
br i1 %tmp.7, label %Loop, label %Exit
Exit: ; preds = %Loop
ret double %V
}
define i32 @test_1() {
; CHECK-LABEL: @test_1(
; CHECK-NEXT: [[TMP1:%.*]] = call [[EMPTY:%.*]] @has_side_effects()
; CHECK-NEXT: ret i32 0
;
%1 = call %empty @has_side_effects()
ret i32 0
}
define i32 @test_not_willreturn() {
; CHECK-LABEL: @test_not_willreturn(
; CHECK-NEXT: [[TMP1:%.*]] = call [[EMPTY:%.*]] @has_side_effects() #[[ATTR1:[0-9]+]]
; CHECK-NEXT: ret i32 0
;
%1 = call %empty @has_side_effects() nounwind readonly
ret i32 0
}
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