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https://github.com/c64scene-ar/llvm-6502.git
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05da4dd998
The number of tail call to loop conversions remains the same (1618 by my count). The new algorithm does a local scan over the use-def chains to identify local "alloca-derived" values, as well as points where the alloca could escape. Then, a visit over the CFG marks blocks as being before or after the allocas have escaped, and annotates the calls accordingly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208017 91177308-0d34-0410-b5e6-96231b3b80d8
177 lines
4.6 KiB
LLVM
177 lines
4.6 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: {{^ *}}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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