tree dc4f553e92719900832253b78570dc8549c2524e
parent d07abde4b8a0354796838b38498037d39276edea
author Tom Eccles <tom.eccles@arm.com> 1754305287 +0100
committer GitHub <noreply@github.com> 1754305287 +0100
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[flang][Lower] Make reduction processing failure a hard error (#150233)

See #150178

This may regress some test cases which only ever passed by accident.

I've tested SPEC2017 and a sample of applications to check that this
doesn't break anything too obvious. Presumably this was not a widely
used feature or we would have noticed the bug sooner.

I'm unsure whether this should be backported to LLVM 21 or not: I think
it is much better to refuse to compile than to silently produce the
wrong result, but there is a chance this could regress something which
previously worked by accident. Opinions welcome.