BLAS TESTING: Improve coverage of `?ROT`, `?ROTG`, `?ROTMG` - #1414

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ACSimon33:blas-cov-rot

Commits on Sep 14, 2026

BLAS: cover the ?rotg underflow case and the ?rotmg DD1 < 0 path

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ea1a688
BLAS: test c/zrotg and cs/zdrot, which no case covered

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9026783
BLAS: reach the scaled arms of c/zrotg

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e9f0658
BLAS: close the reachable arms of c/zrotg and cs/zdrot

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640b4db
BLAS: reach the ?rotmg rescaling arms no input paired with

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65acc38
BLAS: test the ?rotmg rounding guard that two vendor BLAS lack

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bda35ae
BLAS: measure the ?rotg identity against the operand scale

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66b0014