[pull] swiftwasm-release/5.5 from release/5.5 #3811
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…" and ">= 0" comparisons The wrong optimization was: fold x < 0 into false, if x is known to be a result of an unsigned operation with overflow checks enabled. It was done under the wrong assumption that the result of an overflow-checked unsigned operation fits into a signed integer and is positive. This is wrong, because the result of an unsigned operation can be larger than Int.max and therefore, when used in a signed integer operation, be re-interpreted as a negative signed value. Fixes a miscompile which resulted in a missing abort on arithmetic overflow. rdar://73596890
…g-5.5 [5.5] ConstantFolding: remove a wrong peephole optimization for signed "< 0" and ">= 0" comparisons
MaxDesiatov
approved these changes
Oct 29, 2021
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