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[MIPS] Updated MIPS N calling conventions so that fp16 arguments no longer cause a crash #116569

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Nov 19, 2024
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[MIPS] Updated MIPS N calling conventions so that fp16 arguments no longer cause a crash #116569

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15 changes: 8 additions & 7 deletions llvm/lib/Target/Mips/MipsCallingConv.td
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,8 @@ class CCIfSubtargetNot<string F, CCAction A> : CCIfSubtarget<F, A, "!">;

/// Match if the original argument (before lowering) was a float.
/// For example, this is true for i32's that were lowered from soft-float.
class CCIfOrigArgWasNotFloat<CCAction A>
: CCIf<"!static_cast<MipsCCState *>(&State)->WasOriginalArgFloat(ValNo)",
class CCIfOrigArgWasFloat<CCAction A>
: CCIf<"static_cast<MipsCCState *>(&State)->WasOriginalArgFloat(ValNo)",
A>;

/// Match if the original argument (before lowering) was a 128-bit float (i.e.
Expand Down Expand Up @@ -134,12 +134,13 @@ def CC_MipsN : CallingConv<[
CCIfSubtargetNot<"isLittle()",
CCIfInReg<CCPromoteToUpperBitsInType<i64>>>>,

// All integers (except soft-float integers) are promoted to 64-bit.
CCIfType<[i8, i16, i32], CCIfOrigArgWasNotFloat<CCPromoteToType<i64>>>,
// First deal with f32s that got turned into i32s due to soft-float
CCIfType<[i32],
CCIfSubtarget<"useSoftFloat()",
CCIfOrigArgWasFloat<CCDelegateTo<CC_MipsN_SoftFloat>>>>,

// The only i32's we have left are soft-float arguments.
CCIfSubtarget<"useSoftFloat()", CCIfType<[i32],
CCDelegateTo<CC_MipsN_SoftFloat>>>,
// All remaining integers are promoted to 64-bit.
CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,

// Integer arguments are passed in integer registers.
CCIfType<[i64], CCAssignToRegWithShadow<[A0_64, A1_64, A2_64, A3_64,
Expand Down
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