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https://github.com/RPCSX/llvm.git
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586cf3d88d
This restores the commit from SVN r219899 with an additional change to ensure that the CodeGen is correct for the case that was identified as being incorrect (originally PR7272). In the case that during inlining we need to synthesize a value on the stack (i.e. for passing a value byval), then any function involving that alloca must be stripped of its tailness as the restriction that it does not access the parent's stack no longer holds. Unfortunately, a single alloca can cause a rippling effect through out the inlining as the value may be aliased or may be mutated through an escaped external call. As such, we simply track if an alloca has been introduced in the frame during inlining, and strip any tail calls. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220811 91177308-0d34-0410-b5e6-96231b3b80d8
191 lines
4.9 KiB
LLVM
191 lines
4.9 KiB
LLVM
; RUN: opt < %s -tailcallelim -S | FileCheck %s
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declare void @noarg()
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declare void @use(i32*)
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declare void @use_nocapture(i32* nocapture)
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declare void @use2_nocapture(i32* nocapture, i32* nocapture)
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; Trivial case. Mark @noarg with tail call.
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define void @test0() {
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; CHECK: tail call void @noarg()
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call void @noarg()
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ret void
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}
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; PR615. Make sure that we do not move the alloca so that it interferes with the tail call.
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define i32 @test1() {
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; CHECK: i32 @test1()
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; CHECK-NEXT: alloca
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%A = alloca i32 ; <i32*> [#uses=2]
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store i32 5, i32* %A
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call void @use(i32* %A)
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; CHECK: tail call i32 @test1
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%X = tail call i32 @test1() ; <i32> [#uses=1]
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ret i32 %X
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}
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; This function contains intervening instructions which should be moved out of the way
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define i32 @test2(i32 %X) {
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; CHECK: i32 @test2
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; CHECK-NOT: call
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; CHECK: ret i32
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entry:
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%tmp.1 = icmp eq i32 %X, 0 ; <i1> [#uses=1]
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br i1 %tmp.1, label %then.0, label %endif.0
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then.0: ; preds = %entry
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%tmp.4 = add i32 %X, 1 ; <i32> [#uses=1]
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ret i32 %tmp.4
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endif.0: ; preds = %entry
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%tmp.10 = add i32 %X, -1 ; <i32> [#uses=1]
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%tmp.8 = call i32 @test2(i32 %tmp.10) ; <i32> [#uses=1]
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%DUMMY = add i32 %X, 1 ; <i32> [#uses=0]
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ret i32 %tmp.8
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}
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; Though this case seems to be fairly unlikely to occur in the wild, someone
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; plunked it into the demo script, so maybe they care about it.
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define i32 @test3(i32 %c) {
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; CHECK: i32 @test3
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; CHECK-NOT: call
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; CHECK: ret i32 0
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entry:
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%tmp.1 = icmp eq i32 %c, 0 ; <i1> [#uses=1]
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br i1 %tmp.1, label %return, label %else
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else: ; preds = %entry
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%tmp.5 = add i32 %c, -1 ; <i32> [#uses=1]
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%tmp.3 = call i32 @test3(i32 %tmp.5) ; <i32> [#uses=0]
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ret i32 0
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return: ; preds = %entry
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ret i32 0
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}
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; Make sure that a nocapture pointer does not stop adding a tail call marker to
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; an unrelated call and additionally that we do not mark the nocapture call with
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; a tail call.
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;
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; rdar://14324281
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define void @test4() {
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; CHECK: void @test4
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; CHECK-NOT: tail call void @use_nocapture
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; CHECK: tail call void @noarg()
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; CHECK: ret void
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%a = alloca i32
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call void @use_nocapture(i32* %a)
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call void @noarg()
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ret void
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}
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; Make sure that we do not perform TRE even with a nocapture use. This is due to
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; bad codegen caused by PR962.
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;
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; rdar://14324281.
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define i32* @test5(i32* nocapture %A, i1 %cond) {
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; CHECK: i32* @test5
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; CHECK-NOT: tailrecurse:
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; CHECK: ret i32* null
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%B = alloca i32
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br i1 %cond, label %cond_true, label %cond_false
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cond_true:
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call i32* @test5(i32* %B, i1 false)
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ret i32* null
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cond_false:
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call void @use2_nocapture(i32* %A, i32* %B)
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call void @noarg()
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ret i32* null
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}
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; PR14143: Make sure that we do not mark functions with nocapture allocas with tail.
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;
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; rdar://14324281.
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define void @test6(i32* %a, i32* %b) {
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; CHECK-LABEL: @test6(
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; CHECK-NOT: tail call
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; CHECK: ret void
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%c = alloca [100 x i8], align 16
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%tmp = bitcast [100 x i8]* %c to i32*
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call void @use2_nocapture(i32* %b, i32* %tmp)
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ret void
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}
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; PR14143: Make sure that we do not mark functions with nocapture allocas with tail.
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;
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; rdar://14324281
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define void @test7(i32* %a, i32* %b) nounwind uwtable {
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entry:
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; CHECK-LABEL: @test7(
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; CHECK-NOT: tail call
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; CHECK: ret void
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%c = alloca [100 x i8], align 16
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%0 = bitcast [100 x i8]* %c to i32*
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call void @use2_nocapture(i32* %0, i32* %a)
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call void @use2_nocapture(i32* %b, i32* %0)
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ret void
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}
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; If we have a mix of escaping captured/non-captured allocas, ensure that we do
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; not do anything including marking callsites with the tail call marker.
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;
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; rdar://14324281.
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define i32* @test8(i32* nocapture %A, i1 %cond) {
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; CHECK: i32* @test8
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; CHECK-NOT: tailrecurse:
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; CHECK-NOT: tail call
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; CHECK: ret i32* null
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%B = alloca i32
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%B2 = alloca i32
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br i1 %cond, label %cond_true, label %cond_false
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cond_true:
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call void @use(i32* %B2)
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call i32* @test8(i32* %B, i1 false)
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ret i32* null
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cond_false:
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call void @use2_nocapture(i32* %A, i32* %B)
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call void @noarg()
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ret i32* null
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}
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; Don't tail call if a byval arg is captured.
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define void @test9(i32* byval %a) {
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; CHECK-LABEL: define void @test9(
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; CHECK: tail call void @use(
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call void @use(i32* %a)
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ret void
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}
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%struct.X = type { i8* }
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declare void @ctor(%struct.X*)
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define void @test10(%struct.X* noalias sret %agg.result, i1 zeroext %b) {
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; CHECK-LABEL @test10
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entry:
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%x = alloca %struct.X, align 8
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br i1 %b, label %if.then, label %if.end
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if.then: ; preds = %entry
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call void @ctor(%struct.X* %agg.result)
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; CHECK: tail call void @ctor
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br label %return
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if.end:
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call void @ctor(%struct.X* %x)
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; CHECK: call void @ctor
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br label %return
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return:
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ret void
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}
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declare void @test11_helper1(i8** nocapture, i8*)
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declare void @test11_helper2(i8*)
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define void @test11() {
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; CHECK-LABEL: @test11
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; CHECK-NOT: tail
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%a = alloca i8*
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%b = alloca i8
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call void @test11_helper1(i8** %a, i8* %b) ; a = &b
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%c = load i8** %a
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call void @test11_helper2(i8* %c)
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; CHECK: call void @test11_helper2
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ret void
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}
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