Base Compiler Invocation
C benchmarks
-
- icx
![[user]](https://www.spec.org/auto/accel2023/images/user.png)
- CC, LD
-
The Intel oneAPI C compiler.
Fortran benchmarks
-
- ifx
- FC, LD
-
The Intel oneAPI Fortran compiler.
The Intel oneAPI C compiler.
The Intel oneAPI Fortran compiler.
FPORTABILITY flag
No Fortran main method exists, use C equivalent instead.
Enable -O3 -no-prec-div -fp-model fast=2 optimizations.
Optimize for maximum speed and enable more aggressive optimizations that may not improve performance on some programs.
Code is optimized for Intel(R) processors with support for AVX instructions. May generate Intel® AVX-12 Foundation instructions,Intel® AVX-512 Conflict Detectio instructions, Intel® AVX-512 Doubleword and Quadword instructions, Intel® AVX-51 Byte and Word instructions, Intel® AVX-512 Vector Length extensions, Intel® AVX2,VX SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions for Intel® processors. Optimizes for a future Intel® processor. Available in compiler version 15 update 1 and later.
Specifies preferred 512b vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
Determine if certain square root optimizations are enabled.
Enable LTO (Link Time Optimization) in 'full' mode.
Allow aggressive, lossy floating-point optimizations.
Enable the compiler to generate multi-threaded code based on the OpenMP* directives. Similar behavior was granted by -qopenmp in previous versions.
Enable peeling to optimize alignment for vectorization.
Enables peel loop vectorization.
Specifies whether streaming stores are generated:
always - enables generation of streaming stores under the assumption that the application is memory bound
auto - compiler decides when streaming stores are used (DEFAULT)
never - disables generation of streaming stores
Pass argument to clang -cc1
Assume that a scalar declare target variable with implicit data-mapping referenced in a 'target' construct has the same value in the host and device environment
-fimf-precision=value[:funclist]
defines the accuracy (precision) for math library functions
value - defined as one of the following values
high - equivalent to max-error = 0.6
medium - equivalent to max-error = 4 (DEFAULT)
low - equivalent to accuracy-bits = 11 (single
precision); accuracy-bits = 26 (double
precision)
funclist - optional comma separated list of one or more math
library functions to which the attribute should be
applied
use a specific memory model to generate code and store data
small - Restricts code and data to the first 2GB of address
space (DEFAULT)
medium - Restricts code to the first 2GB; it places no memory
restriction on data
large - Places no memory restriction on code or data
Enable -O3 -no-prec-div -fp-model fast=2 optimizations.
Optimize for maximum speed and enable more aggressive optimizations that may not improve performance on some programs.
Code is optimized for Intel(R) processors with support for AVX instructions. May generate Intel® AVX-12 Foundation instructions,Intel® AVX-512 Conflict Detectio instructions, Intel® AVX-512 Doubleword and Quadword instructions, Intel® AVX-51 Byte and Word instructions, Intel® AVX-512 Vector Length extensions, Intel® AVX2,VX SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions for Intel® processors. Optimizes for a future Intel® processor. Available in compiler version 15 update 1 and later.
Specifies preferred 512b vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
Determine if certain square root optimizations are enabled.
Enable LTO (Link Time Optimization) in 'full' mode.
Allow aggressive, lossy floating-point optimizations.
Enable the compiler to generate multi-threaded code based on the OpenMP* directives. Similar behavior was granted by -qopenmp in previous versions.
Enable peeling to optimize alignment for vectorization.
Enables peel loop vectorization.
Specifies whether streaming stores are generated:
always - enables generation of streaming stores under the assumption that the application is memory bound
auto - compiler decides when streaming stores are used (DEFAULT)
never - disables generation of streaming stores
Option standard-realloc-lhs (the default), tells the compiler that when the left-hand side of an assignment is an allocatable object, it should be reallocated to the shape of the right-hand side of the assignment before the assignment occurs. This is the current Fortran Standard definition. This feature may cause extra overhead at run time. This option has the same effect as option assume realloc_lhs.
If you specify nostandard-realloc-lhs, the compiler uses the old Fortran 2003 rules when interpreting assignment statements. The left-hand side is assumed to be allocated with the correct shape to hold the right-hand side. If it is not, incorrect behavior will occur. This option has the same effect as option assume norealloc_lhs.
The align toggle changes how data elements are aligned. Variables and arrays are analyzed and memory layout can be altered. Specifying array64byte will look for opportunities to transform and reailgn arrays to 32byte boundaries.
This option places local variables (scalars and arrays of all types), except those declared as SAVE, on the runtime stack. It is as if the variables were declared with the AUTOMATIC attribute. It does not affect variables that have the SAVE attribute or ALLOCATABLE attribute, or variables that appear in an EQUIVALENCE statement or in a common block. This option may provide a performance gain for your program, but if your program depends on variables having the same value as the last time the routine was invoked, your program may not function properly. If you want to cause variables to be placed in static memory, specify option [Q]save. If you want only scalar variables of certain intrinsic types to be placed on the runtime stack, specify option auto-scalar.
Define the relative error, measured by the number of correct bits,for math library function results
-fimf-precision=value[:funclist]
defines the accuracy (precision) for math library functions
value - defined as one of the following values
high - equivalent to max-error = 0.6
medium - equivalent to max-error = 4 (DEFAULT)
low - equivalent to accuracy-bits = 11 (single
precision); accuracy-bits = 26 (double
precision)
funclist - optional comma separated list of one or more math
library functions to which the attribute should be
applied
Enable -O3 -no-prec-div -fp-model fast=2 optimizations.
Optimize for maximum speed and enable more aggressive optimizations that may not improve performance on some programs.
Code is optimized for Intel(R) processors with support for AVX instructions. May generate Intel® AVX-12 Foundation instructions,Intel® AVX-512 Conflict Detectio instructions, Intel® AVX-512 Doubleword and Quadword instructions, Intel® AVX-51 Byte and Word instructions, Intel® AVX-512 Vector Length extensions, Intel® AVX2,VX SSE4.2, SSE4.1, SSSE3, SSE3, SSE2 and SSE instructions for Intel® processors. Optimizes for a future Intel® processor. Available in compiler version 15 update 1 and later.
Specifies preferred 512b vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
Determine if certain square root optimizations are enabled.
Enable LTO (Link Time Optimization) in 'full' mode.
Allow aggressive, lossy floating-point optimizations.
Enable the compiler to generate multi-threaded code based on the OpenMP* directives. Similar behavior was granted by -qopenmp in previous versions.
Enable peeling to optimize alignment for vectorization.
Enables peel loop vectorization.
Specifies whether streaming stores are generated:
always - enables generation of streaming stores under the assumption that the application is memory bound
auto - compiler decides when streaming stores are used (DEFAULT)
never - disables generation of streaming stores
Pass argument to clang -cc1
Assume that a scalar declare target variable with implicit data-mapping referenced in a 'target' construct has the same value in the host and device environment
-fimf-precision=value[:funclist]
defines the accuracy (precision) for math library functions
value - defined as one of the following values
high - equivalent to max-error = 0.6
medium - equivalent to max-error = 4 (DEFAULT)
low - equivalent to accuracy-bits = 11 (single
precision); accuracy-bits = 26 (double
precision)
funclist - optional comma separated list of one or more math
library functions to which the attribute should be
applied
use a specific memory model to generate code and store data
small - Restricts code and data to the first 2GB of address
space (DEFAULT)
medium - Restricts code to the first 2GB; it places no memory
restriction on data
large - Places no memory restriction on code or data
Option standard-realloc-lhs (the default), tells the compiler that when the left-hand side of an assignment is an allocatable object, it should be reallocated to the shape of the right-hand side of the assignment before the assignment occurs. This is the current Fortran Standard definition. This feature may cause extra overhead at run time. This option has the same effect as option assume realloc_lhs.
If you specify nostandard-realloc-lhs, the compiler uses the old Fortran 2003 rules when interpreting assignment statements. The left-hand side is assumed to be allocated with the correct shape to hold the right-hand side. If it is not, incorrect behavior will occur. This option has the same effect as option assume norealloc_lhs.
The align toggle changes how data elements are aligned. Variables and arrays are analyzed and memory layout can be altered. Specifying array64byte will look for opportunities to transform and reailgn arrays to 32byte boundaries.
This option places local variables (scalars and arrays of all types), except those declared as SAVE, on the runtime stack. It is as if the variables were declared with the AUTOMATIC attribute. It does not affect variables that have the SAVE attribute or ALLOCATABLE attribute, or variables that appear in an EQUIVALENCE statement or in a common block. This option may provide a performance gain for your program, but if your program depends on variables having the same value as the last time the routine was invoked, your program may not function properly. If you want to cause variables to be placed in static memory, specify option [Q]save. If you want only scalar variables of certain intrinsic types to be placed on the runtime stack, specify option auto-scalar.
Define the relative error, measured by the number of correct bits,for math library function results
Flag description origin markings:
|
Indicates that the flag description came from the user flags file. |
![[suite]](https://www.spec.org/auto/accel2023/images/suite.png) |
Indicates that the flag description came from the suite-wide flags file. |
![[benchmark]](https://www.spec.org/auto/accel2023/images/benchmark.png) |
Indicates that the flag description came from a per-benchmark flags file. |
For questions about the meanings of these flags, please contact the tester.
For other inquiries, please contact info@spec.org
Copyright 2023-2025 Standard Performance Evaluation Corporation
Tested with SPEC accel2023 v2.0.18.
Report generated on 2025-10-20 13:07:37 by SPEC accel2023 flags formatter v112 .