derek.holloway
7502bf64a4
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109 lines
2.8 KiB
LLVM
109 lines
2.8 KiB
LLVM
; The inliner should never inline recursive functions into other functions.
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; This effectively is just peeling off the first iteration of a loop, and the
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; inliner heuristics are not set up for this.
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; RUN: opt -passes=inline -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.3"
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@g = common global i32 0 ; <ptr> [#uses=1]
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define internal void @foo(i32 %x) nounwind ssp {
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entry:
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%0 = icmp slt i32 %x, 0 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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bb: ; preds = %entry
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%1 = sub nsw i32 %x, 1 ; <i32> [#uses=1]
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call void @foo(i32 %1) nounwind ssp
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store volatile i32 1, ptr @g, align 4
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ret void
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return: ; preds = %entry
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ret void
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}
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;; CHECK-LABEL: @bonk(
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;; CHECK: call void @foo(i32 42)
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define void @bonk() nounwind ssp {
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entry:
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call void @foo(i32 42) nounwind ssp
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ret void
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}
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;; Here is an indirect case that should not be infinitely inlined.
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define internal void @f1(i32 %x, ptr %Foo, ptr %Bar) nounwind ssp {
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entry:
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%0 = sub nsw i32 %x, 1
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call void %Bar(i32 %0, ptr %Foo, ptr %Bar) nounwind
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store volatile i32 42, ptr @g, align 4
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ret void
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}
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define internal void @f2(i32 %x, ptr %Foo, ptr %Bar) nounwind ssp {
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entry:
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%0 = icmp slt i32 %x, 0 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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bb: ; preds = %entry
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call void %Foo(i32 %x, ptr %Foo, ptr %Bar) nounwind
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store volatile i32 13, ptr @g, align 4
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ret void
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return: ; preds = %entry
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ret void
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}
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; CHECK-LABEL: @top_level(
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; CHECK: call void @f2(i32 122
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; Here we inline one instance of the cycle, but we don't want to completely
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; unroll it.
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define void @top_level() nounwind ssp {
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entry:
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call void @f2(i32 123, ptr @f1, ptr @f2) nounwind ssp
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ret void
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}
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; Check that a recursive function, when called with a constant that makes the
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; recursive path dead code can actually be inlined.
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define i32 @fib(i32 %i) {
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entry:
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%is.zero = icmp eq i32 %i, 0
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br i1 %is.zero, label %zero.then, label %zero.else
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zero.then:
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ret i32 0
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zero.else:
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%is.one = icmp eq i32 %i, 1
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br i1 %is.one, label %one.then, label %one.else
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one.then:
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ret i32 1
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one.else:
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%i1 = sub i32 %i, 1
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%f1 = call i32 @fib(i32 %i1)
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%i2 = sub i32 %i, 2
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%f2 = call i32 @fib(i32 %i2)
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%f = add i32 %f1, %f2
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ret i32 %f
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}
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define i32 @fib_caller() {
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; CHECK-LABEL: @fib_caller(
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; CHECK-NOT: call
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; CHECK: ret
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%f1 = call i32 @fib(i32 0)
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%f2 = call i32 @fib(i32 1)
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%result = add i32 %f1, %f2
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ret i32 %result
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}
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