32 lines
968 B
LLVM
32 lines
968 B
LLVM
; RUN: opt < %s -sccp -loop-deletion -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
|
|
|
|
declare double @sqrt(double) readnone nounwind
|
|
%empty = type {}
|
|
declare %empty @has_side_effects()
|
|
|
|
define double @test_0(i32 %param) {
|
|
; CHECK-LABEL: @test_0(
|
|
; CHECK-NOT: br
|
|
entry:
|
|
; No matter how hard you try, sqrt(1.0) is always 1.0. This allows the
|
|
; optimizer to delete this loop.
|
|
|
|
br label %Loop
|
|
Loop: ; preds = %Loop, %entry
|
|
%I2 = phi i32 [ 0, %entry ], [ %I3, %Loop ] ; <i32> [#uses=1]
|
|
%V = phi double [ 1.000000e+00, %entry ], [ %V2, %Loop ] ; <double> [#uses=2]
|
|
%V2 = call double @sqrt( double %V ) ; <double> [#uses=1]
|
|
%I3 = add i32 %I2, 1 ; <i32> [#uses=2]
|
|
%tmp.7 = icmp ne i32 %I3, %param ; <i1> [#uses=1]
|
|
br i1 %tmp.7, label %Loop, label %Exit
|
|
Exit: ; preds = %Loop
|
|
ret double %V
|
|
}
|
|
|
|
define i32 @test_1() {
|
|
; CHECK-LABEL: @test_1(
|
|
; CHECK: call %empty @has_side_effects()
|
|
%1 = call %empty @has_side_effects()
|
|
ret i32 0
|
|
}
|