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ARM: Allow __fp16 as a function arg or return type for AArch64

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ACLE 2.0 allows __fp16 to be used as a function argument or return
type. This enables this for AArch64.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Oliver Stannard 2014-07-11 13:33:46 +00:00
parent c58b079d23
commit cb047f2a74
4 changed files with 26 additions and 4 deletions
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2
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -270,7 +270,7 @@ SelectionDAGLegalize::ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP) {
EVT OrigVT = VT;
EVT SVT = VT;
while (SVT != MVT::f32) {
while (SVT != MVT::f32 && SVT != MVT::f16) {
SVT = (MVT::SimpleValueType)(SVT.getSimpleVT().SimpleTy - 1);
if (ConstantFPSDNode::isValueValidForType(SVT, CFP->getValueAPF()) &&
// Only do this if the target has a native EXTLOAD instruction from

12
lib/Target/AArch64/AArch64CallingConvention.td
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@ -54,6 +54,8 @@ def CC_AArch64_AAPCS : CallingConv<[
CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
[W0, W1, W2, W3, W4, W5, W6, W7]>>,
CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
@ -65,7 +67,7 @@ def CC_AArch64_AAPCS : CallingConv<[
CCAssignToReg<[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
// If more than will fit in registers, pass them on the stack instead.
CCIfType<[i1, i8, i16], CCAssignToStack<8, 8>>,
CCIfType<[i1, i8, i16, f16], CCAssignToStack<8, 8>>,
CCIfType<[i32, f32], CCAssignToStack<8, 8>>,
CCIfType<[i64, f64, v1f64, v2f32, v1i64, v2i32, v4i16, v8i8],
CCAssignToStack<8, 8>>,
@ -88,6 +90,8 @@ def RetCC_AArch64_AAPCS : CallingConv<[
[X0, X1, X2, X3, X4, X5, X6, X7]>>,
CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
[W0, W1, W2, W3, W4, W5, W6, W7]>>,
CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
@ -129,6 +133,8 @@ def CC_AArch64_DarwinPCS : CallingConv<[
CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
[W0, W1, W2, W3, W4, W5, W6, W7]>>,
CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
@ -141,7 +147,7 @@ def CC_AArch64_DarwinPCS : CallingConv<[
// If more than will fit in registers, pass them on the stack instead.
CCIf<"ValVT == MVT::i1 || ValVT == MVT::i8", CCAssignToStack<1, 1>>,
CCIf<"ValVT == MVT::i16", CCAssignToStack<2, 2>>,
CCIf<"ValVT == MVT::i16 || ValVT == MVT::f16", CCAssignToStack<2, 2>>,
CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
CCIfType<[i64, f64, v1f64, v2f32, v1i64, v2i32, v4i16, v8i8],
CCAssignToStack<8, 8>>,
@ -154,7 +160,7 @@ def CC_AArch64_DarwinPCS_VarArg : CallingConv<[
// Handle all scalar types as either i64 or f64.
CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
CCIfType<[f32], CCPromoteToType<f64>>,
CCIfType<[f16, f32], CCPromoteToType<f64>>,
// Everything is on the stack.
// i128 is split to two i64s, and its stack alignment is 16 bytes.

2
lib/Target/AArch64/AArch64ISelLowering.cpp
View File

@ -1711,6 +1711,8 @@ SDValue AArch64TargetLowering::LowerFormalArguments(
RC = &AArch64::GPR32RegClass;
else if (RegVT == MVT::i64)
RC = &AArch64::GPR64RegClass;
else if (RegVT == MVT::f16)
RC = &AArch64::FPR16RegClass;
else if (RegVT == MVT::f32)
RC = &AArch64::FPR32RegClass;
else if (RegVT == MVT::f64 || RegVT.is64BitVector())

14
test/CodeGen/AArch64/arm64-aapcs.ll
View File

@ -109,3 +109,17 @@ entry:
; CHECK: ldr {{q[0-9]+}}, [sp]
ret <2 x double> %varg_stack;
}
; Check that f16 can be passed and returned (ACLE 2.0 extension)
define half @test_half(float, half %arg) {
; CHECK-LABEL: test_half:
; CHECK: mov v0.16b, v{{[0-9]+}}.16b
ret half %arg;
}
; Check that f16 constants are materialized correctly
define half @test_half_const() {
; CHECK-LABEL: test_half_const:
; CHECK: ldr h0, [x{{[0-9]+}}, :lo12:{{.*}}]
ret half 0xH4248
}