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Wasn't icc rather popular at some point? AMD later suffered in benchmarks where it came out that icc generated code ignored CPU feature flags when the CPU vendo

• acdha 4y ago
  That depends on how you define popular. It was never used for a majority of compiler runs since e.g. no open source project could use it but performance-sensitive users definitely licensed it. One concern I remember was correctness: one company I worked at didn’t find a benefit worth dealing with a second compiler’s quirks and IIRC some scientists I supported evaluated it but never used it because some of their model output varied (classic floating point drift).