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WIP: v3: Update ifx flags to match ifort #481

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ce59cf1
v3: Update ifx flags to match ifort
mathomp4 Sep 23, 2025
e485aa8
Fix typo
mathomp4 Sep 23, 2025
1327f06
Update flags based on MAPL Debug testing
mathomp4 Sep 23, 2025
8b98741
Sync up ifx flags
mathomp4 Sep 25, 2025
d15326d
Fix missing FPE1 in Intel flags
mathomp4 Sep 26, 2025
b562f69
Fix missing FPE1 in Intel flags. Again
mathomp4 Sep 26, 2025
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

### Changed

- Update `ifx` flags to match as close as possible to `ifort` flags

### Deprecated

## [3.65.0] - 2025-09-23
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68 changes: 43 additions & 25 deletions compiler/flags/IntelLLVM_Fortran.cmake
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Original file line number Diff line number Diff line change
@@ -1,26 +1,33 @@
if (CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 15.1)
message(FATAL_ERROR "${CMAKE_Fortran_COMPILER_ID} version must be at least 15.1!")
if (CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 2025.1)
message(FATAL_ERROR "${CMAKE_Fortran_COMPILER_ID} version must be at least 2025.1!")
endif()

set (FOPT0 "-O0")
set (FOPT1 "-O1")
set (FOPT2 "-O2")
set (FOPT3 "-O3")
set (FOPT4 "-O4")
set (FFAST "-fast")

set (DEBINFO "-g")

set (FPE0 "-fpe0")
set (FPE1 "-fpe1")
set (FPE3 "-fpe3")
# ifx does not support -fp-model source (yet? see https://www.intel.com/content/www/us/en/develop/documentation/fortran-compiler-oneapi-dev-guide-and-reference/top/compiler-reference/compiler-options/floating-point-options/fp-model-fp.html)
#set (FP_MODEL_SOURCE "-fp-model source")
set (FP_MODEL_SOURCE "")
set (FP_MODEL_PRECISE "-fp-model precise")
set (FP_MODEL_EXCEPT "-fp-model except")
set (FP_MODEL_SOURCE "-fp-model source")
set (FP_MODEL_STRICT "-fp-model strict")
# ifx does not support -fp-model consistent (yet? see https://www.intel.com/content/www/us/en/develop/documentation/fortran-compiler-oneapi-dev-guide-and-reference/top/compiler-reference/compiler-options/floating-point-options/fp-model-fp.html)
#set (FP_MODEL_CONSISTENT "-fp-model consistent")
set (FP_MODEL_CONSISTENT "")
set (FP_MODEL_CONSISTENT "-fp-model consistent")
set (FP_MODEL_FAST "-fp-model fast")
set (FP_MODEL_FAST1 "-fp-model fast=1")
set (FP_MODEL_FAST2 "-fp-model fast=2")

# Testing with ifx 2025.2 found these flags caused a lot
# of ICEs. For now we turn off
#set (FP_SPECULATION_SAFE "-fp-speculation=safe")
#set (FP_SPECULATION_STRICT "-fp-speculation=strict")

set (OPTREPORT0 "-qopt-report0")
set (OPTREPORT5 "-qopt-report5")

Expand Down Expand Up @@ -77,6 +84,8 @@ set (NOOLD_MAXMINLOC "-assume noold_maxminloc")
set (REALLOC_LHS "-assume realloc_lhs")
set (ARCH_CONSISTENCY "-fimf-arch-consistency=true")
set (FTZ "-ftz")
set (FMA "-fma")
set (NO_FMA "-no-fma")
set (ALIGN_ALL "-align all")
set (NO_ALIAS "-fno-alias")
set (USE_SVML "-fimf-use-svml=true")
Expand Down Expand Up @@ -117,37 +126,46 @@ add_definitions(-DHAVE_SHMEM)

# Common Fortran Flags
# --------------------
set (common_Fortran_flags "${TRACEBACK} ${REALLOC_LHS} ${PP}")
set (common_Fortran_fpe_flags "${FPE0} ${FP_MODEL_SOURCE} ${HEAPARRAYS} ${NOOLD_MAXMINLOC}")
set (common_Fortran_flags "${TRACEBACK} ${REALLOC_LHS} ${OPTREPORT0} ${ALIGN_ALL} ${NO_ALIAS} ${PP}")
set (common_Fortran_fpe_flags "${FTZ} ${NOOLD_MAXMINLOC}")

# GEOS Debug
# ----------
set (GEOS_Fortran_Debug_Flags "${DEBINFO} ${FOPT0} ${FTZ} ${ALIGN_ALL} ${NO_ALIAS} -debug -nolib-inline -fno-inline-functions -assume protect_parens,minus0 -prec-div -check all,noarg_temp_created,nouninit -warn unused -save-temps")
set (GEOS_Fortran_Debug_FPE_Flags "${common_Fortran_fpe_flags}")
set (GEOS_Fortran_Debug_Flags "${DEBINFO} ${FOPT0} -debug -nolib-inline -fno-inline-functions -assume protect_parens,minus0 -prec-div -check all,noarg_temp_created,nouninit ${WARN_UNUSED} -init=snan,arrays -save-temps")
set (GEOS_Fortran_Debug_FPE_Flags "${FPE0} ${FP_MODEL_STRICT} ${FP_SPECULATION_STRICT} ${common_Fortran_fpe_flags} ${SUPPRESS_COMMON_WARNINGS}")

# GEOS Safe
# ----------------
set (GEOS_Fortran_Safe_Flags "${FOPT2} ${DEBINFO}")
set (GEOS_Fortran_Safe_FPE_Flags "${FPE1} ${FP_MODEL_PRECISE} ${FP_MODEL_SOURCE} ${FP_MODEL_CONSISTENT} ${NO_FMA} ${ARCH_CONSISTENCY} ${FP_SPECULATION_STRICT} ${common_Fortran_fpe_flags}")

# GEOS NoVectorize
# ----------------
set (GEOS_Fortran_NoVect_Flags "${FOPT3} ${DEBINFO} ${OPTREPORT0} ${FTZ} ${ALIGN_ALL} ${NO_ALIAS}")
set (GEOS_Fortran_NoVect_FPE_Flags "${common_Fortran_fpe_flags} ${ARCH_CONSISTENCY}")
set (GEOS_Fortran_NoVect_Flags "${FOPT3} ${DEBINFO}")
set (GEOS_Fortran_NoVect_FPE_Flags "${FPE1} ${FP_MODEL_FAST1} ${FP_MODEL_SOURCE} ${FP_MODEL_CONSISTENT} ${NO_FMA} ${ARCH_CONSISTENCY} ${FP_SPECULATION_SAFE} ${common_Fortran_fpe_flags}")

# NOTE It was found that the Vectorizing Flags gave better performance with the same results in testing.
# But in case they are needed, we keep the older flags available

# GEOS Vectorize
# --------------
set (GEOS_Fortran_Vect_Flags "${FOPT3} ${DEBINFO} ${MARCH_FLAG} -fma -qopt-report0 ${FTZ} ${ALIGN_ALL} ${NO_ALIAS} -align array32byte")
set (GEOS_Fortran_Vect_FPE_Flags "${FPE3} ${FP_MODEL_CONSISTENT} ${NOOLD_MAXMINLOC}")
# GEOS Stock-Vect
# ---------------
set (GEOS_Fortran_StockVect_Flags "${FOPT3} ${DEBINFO} ${MARCH_FLAG} ${FMA} -align array32byte")
set (GEOS_Fortran_StockVect_FPE_Flags "${FPE3} ${FP_MODEL_FAST} ${FP_MODEL_SOURCE} ${FP_MODEL_CONSISTENT} ${common_Fortran_fpe_flags}")

# GEOS Release
# ------------
set (GEOS_Fortran_Release_Flags "${GEOS_Fortran_Vect_Flags}")
set (GEOS_Fortran_Release_FPE_Flags "${GEOS_Fortran_Vect_FPE_Flags}")
# GEOS Vectorize
# ---------------
set (GEOS_Fortran_Vect_Flags "${FOPT3} ${DEBINFO} ${MARCH_FLAG} -align array32byte")
set (GEOS_Fortran_Vect_FPE_Flags "${FPE1} ${FP_MODEL_FAST1} ${FP_MODEL_SOURCE} ${FP_MODEL_CONSISTENT} ${NO_FMA} ${ARCH_CONSISTENCY} ${FP_SPECULATION_SAFE} ${common_Fortran_fpe_flags}")

# GEOS Aggressive
# ---------------
set (GEOS_Fortran_Aggressive_Flags "${FOPT3} ${DEBINFO} ${MARCH_FLAG} -fma -qopt-report0 ${FTZ} ${ALIGN_ALL} ${NO_ALIAS} -align array32byte")
#set (GEOS_Fortran_Aggressive_Flags "${FOPT3} ${DEBINFO} -xSKYLAKE-AVX512 -qopt-zmm-usage=high -fma -qopt-report0 ${FTZ} ${ALIGN_ALL} ${NO_ALIAS} -align array64byte")
set (GEOS_Fortran_Aggressive_FPE_Flags "${FPE3} ${FP_MODEL_FAST2} ${USE_SVML} ${NOOLD_MAXMINLOC}")
set (GEOS_Fortran_Aggressive_Flags "${FOPT3} ${DEBINFO} ${MARCH_FLAG} -align array32byte")
set (GEOS_Fortran_Aggressive_FPE_Flags "${FPE3} ${FP_MODEL_FAST2} ${FP_MODEL_SOURCE} ${FP_MODEL_CONSISTENT} ${FMA} ${FP_SPECULATION_FAST} ${USE_SVML} ${common_Fortran_fpe_flags}")

# Set Release flags
# -----------------
set (GEOS_Fortran_Release_Flags "${GEOS_Fortran_Vect_Flags}")
set (GEOS_Fortran_Release_FPE_Flags "${GEOS_Fortran_Vect_FPE_Flags}")

# Common variables for every compiler
include(Generic_Fortran)
1 change: 1 addition & 0 deletions compiler/flags/Intel_Fortran.cmake
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Expand Up @@ -10,6 +10,7 @@ set (FOPT4 "-O4")
set (DEBINFO "-g")

set (FPE0 "-fpe0")
set (FPE1 "-fpe1")
set (FPE3 "-fpe3")
set (FP_MODEL_PRECISE "-fp-model precise")
set (FP_MODEL_EXCEPT "-fp-model except")
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