[PATCH] D81940: [flang] AMAX0, MIN1... rewrite to MAX/MIN: make result conversion explicit

[Jean Perier via Phabricator via llvm-commits]

jeanPerier created this revision.
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This patch changes speficic extremum functions rewrite to generic MIN/MAX.
It applies to AMAX0, AMIN0, AMAX1, AMIN1, MAX0, MIN0, MAX1, MIN1, DMAX1,
and DMIN1.

- Do not re-write specific extremums to MAX/MIN in intrinsic Probe and let

folding rewrite it and introduc the conversion on the MIN/MAX result.

- Also make operand promotion explicit in MIN/MAX folding.

For instance, after this patch:
AMAX0(int8, int4) is rewritten to REAL(MAX(int8, INT(int4, 8)))

All this care is to avoid rewritting it to MAX(REAL(int8), REAL(int4))
that may not always be numerically equivalent to the first rewrite.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D81940

Files:
  flang/lib/Evaluate/fold-implementation.h
  flang/lib/Evaluate/fold-integer.cpp
  flang/lib/Evaluate/fold-real.cpp
  flang/lib/Evaluate/intrinsics.cpp
  flang/test/Evaluate/folding04.f90

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