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feat: add integer widths and checked numeric conversions

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This commit is contained in:
Valdemar Høgsvig Lorenzen
2026-10-25 22:19:14 +01:00
parent 0385e46295
commit 3e93c6f000
12 changed files with 500 additions and 66 deletions
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source/llvm/instructions.hon
+78 -8
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@@ -136,6 +136,7 @@ emit_instruction proc(state @mut State, block @ir.Block, instruction ir.Instruct
}
try io.write_all(output, ")\n")
}
.convert: result = try emit_conversion(state, instruction)
.negate: {
operand :: try load(state, instruction.left)
if (instruction.type == .float) {
@@ -143,10 +144,12 @@ emit_instruction proc(state @mut State, block @ir.Block, instruction ir.Instruct
} else {
pair :: fresh(state)
overflow :: fresh(state)
try io.print(" %r{} = call {{ i64, i1 }} @llvm.ssub.with.overflow.i64(i64 0, i64 %r{})\n", output, {pair, operand})
try io.print(" %r{} = extractvalue {{ i64, i1 }} %r{}, 1\n", output, {overflow, pair})
bits :: ir.integer_bits(instruction.type)
sign []u8 :: if (ir.unsigned_integer(instruction.type)) "u" else "s"
try io.print(" %r{} = call {{ i{}, i1 }} @llvm.{s}sub.with.overflow.i{}(i{} 0, i{} %r{})\n", output, {pair, bits, sign, bits, bits, bits, operand})
try io.print(" %r{} = extractvalue {{ i{}, i1 }} %r{}, 1\n", output, {overflow, bits, pair})
try check_failure(state, overflow, .integer_overflow, instruction.span)
try io.print(" %r{} = extractvalue {{ i64, i1 }} %r{}, 0\n", output, {result, pair})
try io.print(" %r{} = extractvalue {{ i{}, i1 }} %r{}, 0\n", output, {result, bits, pair})
}
}
.logical_not: {
@@ -172,13 +175,14 @@ emit_instruction proc(state @mut State, block @ir.Block, instruction ir.Instruct
.multiply: "mul"
else: unreachable
}
sign []u8 :: if (instruction.type == .usize) "u" else "s"
bits :: ir.integer_bits(instruction.type)
sign []u8 :: if (ir.unsigned_integer(instruction.type)) "u" else "s"
pair :: fresh(state)
overflow :: fresh(state)
try io.print(" %r{} = call {{ i64, i1 }} @llvm.{s}{s}.with.overflow.i64(i64 %r{}, i64 %r{})\n", output, {pair, sign, opcode, left, right})
try io.print(" %r{} = extractvalue {{ i64, i1 }} %r{}, 1\n", output, {overflow, pair})
try io.print(" %r{} = call {{ i{}, i1 }} @llvm.{s}{s}.with.overflow.i{}(i{} %r{}, i{} %r{})\n", output, {pair, bits, sign, opcode, bits, bits, left, bits, right})
try io.print(" %r{} = extractvalue {{ i{}, i1 }} %r{}, 1\n", output, {overflow, bits, pair})
try check_failure(state, overflow, .integer_overflow, instruction.span)
try io.print(" %r{} = extractvalue {{ i64, i1 }} %r{}, 0\n", output, {result, pair})
try io.print(" %r{} = extractvalue {{ i{}, i1 }} %r{}, 0\n", output, {result, bits, pair})
}
}
.equal, .not_equal, .less, .less_equal, .greater, .greater_equal: {
@@ -199,7 +203,7 @@ emit_instruction proc(state @mut State, block @ir.Block, instruction ir.Instruct
} else {
prefix []u8 := ""
if (instruction.op != .equal and instruction.op != .not_equal) {
if (operand_type.kind == .usize) prefix = "u"
if (ir.unsigned_integer(operand_type.kind)) prefix = "u"
else prefix = "s"
}
predicate []u8 :: match instruction.op {
@@ -219,3 +223,69 @@ emit_instruction proc(state @mut State, block @ir.Block, instruction ir.Instruct
}
try store(state, instruction.destination, result)
}
@hide:file
emit_conversion proc(state @mut State, instruction ir.Instruction) usize ! io.WriteError {
output :: state.output
source :: state.values[usize(instruction.left)].kind
destination :: instruction.type
operand :: try load(state, instruction.left)
if (source == .float and destination == .float) return operand
source_bits :: ir.integer_bits(source)
destination_bits :: ir.integer_bits(destination)
source_unsigned :: ir.unsigned_integer(source)
destination_unsigned :: ir.unsigned_integer(destination)
if (destination == .float) {
result :: fresh(state)
opcode []u8 :: if (source_unsigned) "uitofp" else "sitofp"
try io.print(" %r{} = {s} i{} %r{} to double\n", output, {result, opcode, source_bits, operand})
return result
}
if (source == .float) {
# compare the truncated value before fptosi/fptoui, whose out-of-range result is poison.
truncated :: fresh(state)
lower_valid :: fresh(state)
upper_valid :: fresh(state)
valid :: fresh(state)
failed :: fresh(state)
upper []u8 :: match destination {
.i8: "1.280000e+02"
.i16: "3.276800e+04"
.i32: "2.147483648e+09"
.int, .isize: "9.223372036854775808e+18"
.u8: "2.560000e+02"
.u16: "6.553600e+04"
.u32: "4.294967296e+09"
.u64, .usize: "1.8446744073709551616e+19"
else: unreachable
}
try io.print(" %r{} = call double @llvm.trunc.f64(double %r{})\n", output, {truncated, operand})
if (destination_unsigned) try io.print(" %r{} = fcmp oge double %r{}, 0.0\n", output, {lower_valid, truncated})
else try io.print(" %r{} = fcmp oge double %r{}, -{s}\n", output, {lower_valid, truncated, upper})
try io.print(" %r{} = fcmp olt double %r{}, {s}\n", output, {upper_valid, truncated, upper})
try io.print(" %r{} = and i1 %r{}, %r{}\n", output, {valid, lower_valid, upper_valid})
try io.print(" %r{} = xor i1 %r{}, true\n", output, {failed, valid})
try check_failure(state, failed, .integer_overflow, instruction.span)
result :: fresh(state)
opcode []u8 :: if (destination_unsigned) "fptoui" else "fptosi"
try io.print(" %r{} = {s} double %r{} to i{}\n", output, {result, opcode, truncated, destination_bits})
return result
}
if (!source_unsigned and (destination_unsigned or destination_bits < source_bits)) {
failed :: fresh(state)
try io.print(" %r{} = icmp slt i{} %r{}, {}\n", output, {failed, source_bits, operand, ir.integer_min(destination)})
try check_failure(state, failed, .integer_overflow, instruction.span)
}
if (destination_bits < source_bits or (source_unsigned and !destination_unsigned and destination_bits == source_bits)) {
failed :: fresh(state)
predicate []u8 :: if (source_unsigned) "ugt" else "sgt"
try io.print(" %r{} = icmp {s} i{} %r{}, {}\n", output, {failed, predicate, source_bits, operand, ir.integer_max(destination)})
try check_failure(state, failed, .integer_overflow, instruction.span)
}
if (source_bits == destination_bits) return operand
result :: fresh(state)
opcode []u8 := "trunc"
if (source_bits < destination_bits) opcode = if (source_unsigned) "zext" else "sext"
try io.print(" %r{} = {s} i{} %r{} to i{}\n", output, {result, opcode, source_bits, operand, destination_bits})
return result
}