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[MIR] Support +inf and -inf literals #221127

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[MIR] Support +inf and -inf literals #221127

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14 changes: 14 additions & 0 deletions llvm/lib/CodeGen/MIRParser/MILexer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -639,6 +639,18 @@ static Cursor maybeLexFloatHexBits(Cursor C, MIToken &Token) {
return C;
}

static Cursor maybeLexInfinityLiteral(Cursor C, MIToken &Token) {
if ((C.peek() != '+' && C.peek() != '-') || C.peek(1) != 'i' ||
C.peek(2) != 'n' || C.peek(3) != 'f' ||
isIdentifierChar(C.peek(4)))
return std::nullopt;

auto Range = C;
C.advance(4);
Token.reset(MIToken::FloatingPointLiteral, Range.upto(C));
return C;
}

static Cursor maybeLexNumericalLiteral(Cursor C, MIToken &Token) {
if (!isdigit(C.peek()) && (C.peek() != '-' || !isdigit(C.peek(1))))
return std::nullopt;
Expand Down Expand Up @@ -779,6 +791,8 @@ StringRef llvm::lexMIToken(StringRef Source, MIToken &Token,
return R.remaining();
if (Cursor R = maybeLexFloatHexBits(C, Token))
return R.remaining();
if (Cursor R = maybeLexInfinityLiteral(C, Token))
return R.remaining();
if (Cursor R = maybeLexIdentifier(C, Token))
return R.remaining();
if (Cursor R = maybeLexJumpTableIndex(C, Token))
Expand Down
11 changes: 11 additions & 0 deletions llvm/test/CodeGen/MIR/Generic/fp-infinity.mir
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@@ -0,0 +1,11 @@
# RUN: llc -run-pass none -o - %s | FileCheck %s

---
name: fp_infinity
body: |
bb.0:
; CHECK: %0:_(s32) = G_FCONSTANT float +inf
; CHECK: %1:_(s32) = G_FCONSTANT float -inf
%0:_(s32) = G_FCONSTANT float +inf
%1:_(s32) = G_FCONSTANT float -inf
...