Hi all,
Thank you for the feedback so far.
This version of the patch doesn't try to emit fmin/fmax function calls but
instead
emits MIN/MAX_EXPR sequences unconditionally.
I think a source of confusion in the original proposal (for me at least) was
that on aarch64 (that I primarily work on) we implement the fmin/fmax optabs
and therefore these calls are expanded to a single instruction.
But on x86_64 these optabs are not implemented and therefore expand to actual
library calls.
Therefore at -O3 (no -ffast-math) I saw a gain on aarch64. But I measured today
on x86_64 and saw a regression.
Thomas and Janne suggested that the Fortran standard does not impose a
requirement
on NaN handling for the min/max intrinsics, which would make emitting
MIN/MAX_EXPR
sequences unconditionally a valid approach.
However, the gfortran.dg/nan_1.f90 test checks that handling of NaN values in
these intrinsics follows the IEEE semantics (min (nan, 2.0) == 2.0, for
example).
This is not required by the standard, but is the existing gfortran behaviour.
If we end up always emitting MIN/MAX_EXPR sequences, like this version of the
patch does,
then that test fails on some configurations of x86_64 and not others (for me it
FAILs
by default, but passes with -march=native on my machine) and passes on AArch64.
This is expected since MIN/MAX_EXPR doesn't enforce IEEE behaviour on its
arguments.
However, by always emitting MIN/MAX_EXPR the gfc_conv_intrinsic_minmax function
is
simplified and, perhaps more importantly, generates faster code in the -O3 case.
With this patch I see performance improvement on 521.wrf on both AArch64 (3.7%)
and x86_64 (5.4%).
Thomas, Janne, would this relaxation of NaN handling be acceptable given the
benefits
mentioned above? If so, what would be the recommended adjustment to the
nan_1.f90 test?
Thanks,
Kyrill
2018-07-18 Kyrylo Tkachov <kyrylo.tkac...@arm.com>
* trans-intrinsic.c: (gfc_conv_intrinsic_minmax): Emit MIN_MAX_EXPR
sequence to calculate the min/max.
2018-07-18 Kyrylo Tkachov <kyrylo.tkac...@arm.com>
* gfortran.dg/max_float.f90: New test.
* gfortran.dg/min_float.f90: Likewise.
* gfortran.dg/minmax_integer.f90: Likewise.
diff --git a/gcc/fortran/trans-intrinsic.c b/gcc/fortran/trans-intrinsic.c
index d306e3a5a6209c1621d91f99ffc366acecd9c3d0..e5a1f1ddabeedc7b9f473db11e70f29548fc69ac 100644
--- a/gcc/fortran/trans-intrinsic.c
+++ b/gcc/fortran/trans-intrinsic.c
@@ -3874,14 +3874,11 @@ gfc_conv_intrinsic_ttynam (gfc_se * se, gfc_expr * expr)
minmax (a1, a2, a3, ...)
{
mvar = a1;
- if (a2 .op. mvar || isnan (mvar))
- mvar = a2;
- if (a3 .op. mvar || isnan (mvar))
- mvar = a3;
+ mvar = MIN/MAX_EXPR (mvar, a2);
+ mvar = MIN/MAX_EXPR (mvar, a3);
...
- return mvar
- }
- */
+ return mvar;
+ } */
/* TODO: Mismatching types can occur when specific names are used.
These should be handled during resolution. */
@@ -3891,7 +3888,6 @@ gfc_conv_intrinsic_minmax (gfc_se * se, gfc_expr * expr, enum tree_code op)
tree tmp;
tree mvar;
tree val;
- tree thencase;
tree *args;
tree type;
gfc_actual_arglist *argexpr;
@@ -3912,55 +3908,37 @@ gfc_conv_intrinsic_minmax (gfc_se * se, gfc_expr * expr, enum tree_code op)
mvar = gfc_create_var (type, "M");
gfc_add_modify (&se->pre, mvar, args[0]);
- for (i = 1, argexpr = argexpr->next; i < nargs; i++)
- {
- tree cond, isnan;
+ for (i = 1, argexpr = argexpr->next; i < nargs; i++, argexpr = argexpr->next)
+ {
+ tree cond = NULL_TREE;
val = args[i];
/* Handle absent optional arguments by ignoring the comparison. */
if (argexpr->expr->expr_type == EXPR_VARIABLE
&& argexpr->expr->symtree->n.sym->attr.optional
&& TREE_CODE (val) == INDIRECT_REF)
- cond = fold_build2_loc (input_location,
+ {
+ cond = fold_build2_loc (input_location,
NE_EXPR, logical_type_node,
TREE_OPERAND (val, 0),
build_int_cst (TREE_TYPE (TREE_OPERAND (val, 0)), 0));
- else
- {
- cond = NULL_TREE;
-
+ }
+ else if (!VAR_P (val) && !TREE_CONSTANT (val))
/* Only evaluate the argument once. */
- if (!VAR_P (val) && !TREE_CONSTANT (val))
- val = gfc_evaluate_now (val, &se->pre);
- }
-
- thencase = build2_v (MODIFY_EXPR, mvar, convert (type, val));
+ val = gfc_evaluate_now (val, &se->pre);
- tmp = fold_build2_loc (input_location, op, logical_type_node,
- convert (type, val), mvar);
+ tree calc;
- /* FIXME: When the IEEE_ARITHMETIC module is implemented, the call to
- __builtin_isnan might be made dependent on that module being loaded,
- to help performance of programs that don't rely on IEEE semantics. */
- if (FLOAT_TYPE_P (TREE_TYPE (mvar)))
- {
- isnan = build_call_expr_loc (input_location,
- builtin_decl_explicit (BUILT_IN_ISNAN),
- 1, mvar);
- tmp = fold_build2_loc (input_location, TRUTH_OR_EXPR,
- logical_type_node, tmp,
- fold_convert (logical_type_node, isnan));
- }
- tmp = build3_v (COND_EXPR, tmp, thencase,
- build_empty_stmt (input_location));
+ tree_code code = op == GT_EXPR ? MAX_EXPR : MIN_EXPR;
+ calc = fold_build2_loc (input_location, code, type,
+ convert (type, val), mvar);
+ tmp = build2_v (MODIFY_EXPR, mvar, calc);
if (cond != NULL_TREE)
tmp = build3_v (COND_EXPR, cond, tmp,
build_empty_stmt (input_location));
-
gfc_add_expr_to_block (&se->pre, tmp);
- argexpr = argexpr->next;
}
se->expr = mvar;
}
diff --git a/gcc/testsuite/gfortran.dg/max_float.f90 b/gcc/testsuite/gfortran.dg/max_float.f90
new file mode 100644
index 0000000000000000000000000000000000000000..a3a5d4f5df29cfa9c4e3abc2c18e7d3de1169fc3
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/max_float.f90
@@ -0,0 +1,19 @@
+! { dg-do compile }
+! { dg-options "-O2 -fdump-tree-optimized" }
+
+subroutine fool (a, b, c, d, e, f, g, h)
+ real (kind=16) :: a, b, c, d, e, f, g, h
+ a = max (a, b, c, d, e, f, g, h)
+end subroutine
+
+subroutine foo (a, b, c, d, e, f, g, h)
+ real (kind=8) :: a, b, c, d, e, f, g, h
+ a = max (a, b, c, d, e, f, g, h)
+end subroutine
+
+subroutine foof (a, b, c, d, e, f, g, h)
+ real (kind=4) :: a, b, c, d, e, f, g, h
+ a = max (a, b, c, d, e, f, g, h)
+end subroutine
+
+! { dg-final { scan-tree-dump-times "MAX_EXPR " 21 "optimized" } }
diff --git a/gcc/testsuite/gfortran.dg/min_float.f90 b/gcc/testsuite/gfortran.dg/min_float.f90
new file mode 100644
index 0000000000000000000000000000000000000000..41bd6b3c4062f364791841f7097f9a5c00782ec8
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/min_float.f90
@@ -0,0 +1,19 @@
+! { dg-do compile }
+! { dg-options "-O2 -fdump-tree-optimized" }
+
+subroutine fool (a, b, c, d, e, f, g, h)
+ real (kind=16) :: a, b, c, d, e, f, g, h
+ a = min (a, b, c, d, e, f, g, h)
+end subroutine
+
+subroutine foo (a, b, c, d, e, f, g, h)
+ real (kind=8) :: a, b, c, d, e, f, g, h
+ a = min (a, b, c, d, e, f, g, h)
+end subroutine
+
+subroutine foof (a, b, c, d, e, f, g, h)
+ real (kind=4) :: a, b, c, d, e, f, g, h
+ a = min (a, b, c, d, e, f, g, h)
+end subroutine
+
+! { dg-final { scan-tree-dump-times "MIN_EXPR " 21 "optimized" } }
diff --git a/gcc/testsuite/gfortran.dg/minmax_integer.f90 b/gcc/testsuite/gfortran.dg/minmax_integer.f90
new file mode 100644
index 0000000000000000000000000000000000000000..5b6be38c7055ce4e8620cf75ec7d8a182436b24f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/minmax_integer.f90
@@ -0,0 +1,15 @@
+! { dg-do compile }
+! { dg-options "-O2 -fdump-tree-optimized" }
+
+subroutine foo (a, b, c, d, e, f, g, h)
+ integer (kind=4) :: a, b, c, d, e, f, g, h
+ a = min (a, b, c, d, e, f, g, h)
+end subroutine
+
+subroutine foof (a, b, c, d, e, f, g, h)
+ integer (kind=4) :: a, b, c, d, e, f, g, h
+ a = max (a, b, c, d, e, f, g, h)
+end subroutine
+
+! { dg-final { scan-tree-dump-times "MIN_EXPR" 7 "optimized" } }
+! { dg-final { scan-tree-dump-times "MAX_EXPR" 7 "optimized" } }
