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[Hexagon] Allow tail-call optimization when mixing C and fast calling conv

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Patch by Arnold Schwaighofer.

llvm-svn: 279251
This commit is contained in:
Krzysztof Parzyszek 2016-08-19 15:02:18 +00:00
parent 6c216ccafc
commit 7674324b11
2 changed files with 31 additions and 3 deletions
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12
lib/Target/Hexagon/HexagonISelLowering.cpp
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@ -3143,9 +3143,15 @@ bool HexagonTargetLowering::IsEligibleForTailCallOptimization(
return false;
}
// Do not optimize if the calling conventions do not match.
if (!CCMatch)
return false;
// Do not optimize if the calling conventions do not match and the conventions
// used are not C or Fast.
if (!CCMatch) {
bool R = (CallerCC == CallingConv::C || CallerCC == CallingConv::Fast);
bool E = (CalleeCC == CallingConv::C || CalleeCC == CallingConv::Fast);
// If R & E, then ok.
if (!R || !E)
return false;
}
// Do not tail call optimize vararg calls.
if (isVarArg)

22
test/CodeGen/Hexagon/tailcall_fastcc_ccc.ll Normal file
View File

@ -0,0 +1,22 @@
; RUN: llc -march=hexagon < %s | FileCheck %s
target triple = "hexagon"
declare hidden fastcc void @callee(i32, i32) #0
declare hidden void @callee2(i32, i32) #0
; CHECK: jump callee
define void @caller(i32 %pp) #0 {
entry:
tail call fastcc void @callee(i32 %pp, i32 0)
ret void
}
; CHECK: jump callee2
define void @caller2(i32 %pp) #0 {
entry:
tail call fastcc void @callee2(i32 %pp, i32 0)
ret void
}
attributes #0 = { nounwind }