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[PowerPC] Support multiple return values with fast isel

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Using an LLVM IR aggregate return value type containing three
or more integer values causes an abort in the fast isel pass.

This patch adds two more registers to RetCC_PPC64_ELF_FIS to
allow returning up to four integers with fast isel, just the
same as is currently supported with regular isel (RetCC_PPC).

This is needed for Swift and (possibly) other non-clang frontends.

Fixes PR26190.

llvm-svn: 272005
This commit is contained in:
Ulrich Weigand 2016-06-07 12:48:22 +00:00
parent 5c22a56177
commit f4980a0fe0
2 changed files with 22 additions and 1 deletions
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2
lib/Target/PowerPC/PPCCallingConv.td
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@ -112,7 +112,7 @@ def RetCC_PPC64_ELF_FIS : CallingConv<[
CCIfType<[i8], CCPromoteToType<i64>>,
CCIfType<[i16], CCPromoteToType<i64>>,
CCIfType<[i32], CCPromoteToType<i64>>,
CCIfType<[i64], CCAssignToReg<[X3, X4]>>,
CCIfType<[i64], CCAssignToReg<[X3, X4, X5, X6]>>,
CCIfType<[i128], CCAssignToReg<[X3, X4, X5, X6]>>,
CCIfType<[f32], CCAssignToReg<[F1, F2, F3, F4, F5, F6, F7, F8]>>,
CCIfType<[f64], CCAssignToReg<[F1, F2, F3, F4, F5, F6, F7, F8]>>,

21
test/CodeGen/PowerPC/multi-return.ll Normal file
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@ -0,0 +1,21 @@
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -O0 < %s | FileCheck %s
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -O2 < %s | FileCheck %s
; Verify that returning multiple return values in registers works,
; both with fast-isel and regular isel.
define { i32, i32, i32, i32 } @foo() nounwind {
%A1 = insertvalue { i32, i32, i32, i32 } undef, i32 1, 0
%A2 = insertvalue { i32, i32, i32, i32 } %A1, i32 2, 1
%A3 = insertvalue { i32, i32, i32, i32 } %A2, i32 3, 2
%A4 = insertvalue { i32, i32, i32, i32 } %A3, i32 4, 3
ret { i32, i32, i32, i32 } %A4
}
; CHECK-LABEL: foo:
; CHECK: li 3, 1
; CHECK: li 4, 2
; CHECK: li 5, 3
; CHECK: li 6, 4
; CHECK: blr