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[mips] Do not tail-call optimize vararg functions or functions with byval

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arguments.

This is rather conservative and should be fixed later to be more aggressive.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2012-10-27 00:56:56 +00:00
parent 4618e0b574
commit 21a9a98b77
3 changed files with 66 additions and 9 deletions
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58
test/CodeGen/Mips/tailcall.ll
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@@ -66,9 +66,15 @@ declare i32 @callee4(i32, i32, i32, i32, i32, i32, i32, i32, i32)
define i32 @caller5() nounwind readonly {
entry:
; PIC32: .ent caller5
; PIC32-NOT: jalr
; PIC32: .end caller5
; STATIC32: .ent caller5
; STATIC32-NOT: jal
; STATIC32: .end caller5
; N64: .ent caller5
; N64-NOT: jalr
; N64: .end caller5
%0 = load i32* @g0, align 4
%1 = load i32* @g1, align 4
@@ -98,3 +104,55 @@ entry:
ret i32 %add8
}
declare i32 @callee8(i32, ...)
define i32 @caller8_0() nounwind {
entry:
%call = tail call fastcc i32 @caller8_1()
ret i32 %call
}
define internal fastcc i32 @caller8_1() nounwind noinline {
entry:
; PIC32: .ent caller8_1
; PIC32: jalr
; PIC32: .end caller8_1
; STATIC32: .ent caller8_1
; STATIC32: jal
; STATIC32: .end caller8_1
; N64: .ent caller8_1
; N64: jalr
; N64: .end caller8_1
%call = tail call i32 (i32, ...)* @callee8(i32 2, i32 1) nounwind
ret i32 %call
}
%struct.S = type { [2 x i32] }
@gs1 = external global %struct.S
declare i32 @callee9(%struct.S* byval)
define i32 @caller9_0() nounwind {
entry:
%call = tail call fastcc i32 @caller9_1()
ret i32 %call
}
define internal fastcc i32 @caller9_1() nounwind noinline {
entry:
; PIC32: .ent caller9_1
; PIC32: jalr
; PIC32: .end caller9_1
; STATIC32: .ent caller9_1
; STATIC32: jal
; STATIC32: .end caller9_1
; N64: .ent caller9_1
; N64: jalr
; N64: .end caller9_1
%call = tail call i32 @callee9(%struct.S* byval @gs1) nounwind
ret i32 %call
}