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// Make sure that the dead code of an `if` (and `else if`) is elminated when the condition is constant.
// If the condition value is constant, there are two cases:
// 1) It is 0 (false) -> Generate the else block (if it exists) with no branching.
// 2) It is non-0 (true) -> Generate the if block with no branching.
// Also, verify it _does_ generate correct code when it is not constant.
// RUN: %ldc -O0 -output-ll -of=%t.ll %s && FileCheck %s < %t.ll
extern(C): //to avoid name mangling.
// CHECK-LABEL: @foo
void foo()
{
// CHECK-NOT: %a = alloca
// CHECK: %b = alloca
// CHECK-NOT: br
// CHECK-NOT: store i32 1, i32* %a
// CHECK: store i32 2, i32* %b
if (0)
{
int a = 1;
}
else
{
int b = 2;
}
}
// CHECK-LABEL: @bar
void bar()
{
// CHECK-NOT: %a = alloca
// CHECK: store i32 2, i32* %b
if (0)
{
int a = 1;
}
else if(1)
{
int b = 2;
}
}
// CHECK-LABEL: @only_ret
void only_ret()
{
// CHECK-NEXT: ret void
// CHECK-NEXT: }
if (1 && (2 - 2))
{
int a = 1;
}
}
// CHECK-LABEL: @only_ret2
void only_ret2()
{
// CHECK-NEXT: ret void
// CHECK-NEXT: }
if (0)
{
int a = 1;
}
else if(0)
{
int b = 2;
}
}
// CHECK-LABEL: @gen_br
void gen_br(immutable int a)
{
// CHECK-COUNT-1: br
if (a)
{
int b = 1;
}
}
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