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make it more clear we should do UB wrapping optimizations for ptr arithmetic

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drew 2021-11-14 19:26:12 -08:00 committed by Andrew Kelley
parent ad4627ea3b
commit dffa6dcaf9
1 changed files with 2 additions and 3 deletions
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5
src/codegen/c.zig
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@ -1123,15 +1123,14 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.unreach => try airUnreach(f), .unreach => try airUnreach(f),
.fence => try airFence(f, inst), .fence => try airFence(f, inst),
.ptr_add => try airPtrAddSub (f, inst, " + "),
.ptr_sub => try airPtrAddSub (f, inst, " - "),
// TODO use a different strategy for add that communicates to the optimizer // TODO use a different strategy for add that communicates to the optimizer
// that wrapping is UB. // that wrapping is UB.
.add => try airBinOp (f, inst, " + "), .add => try airBinOp (f, inst, " + "),
.ptr_add => try airPtrAddSub (f, inst, " + "),
// TODO use a different strategy for sub that communicates to the optimizer // TODO use a different strategy for sub that communicates to the optimizer
// that wrapping is UB. // that wrapping is UB.
.sub => try airBinOp (f, inst, " - "), .sub => try airBinOp (f, inst, " - "),
.ptr_sub => try airPtrAddSub (f, inst, " - "),
// TODO use a different strategy for mul that communicates to the optimizer // TODO use a different strategy for mul that communicates to the optimizer
// that wrapping is UB. // that wrapping is UB.
.mul => try airBinOp (f, inst, " * "), .mul => try airBinOp (f, inst, " * "),