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revert: match.pd: Add flag_unsafe_math_optimizations check before deciding on the widest type in...

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2019-09-11  Richard Biener  <rguenther@suse.de>

	Revert
	2019-09-09  Barnaby Wilks  <barnaby.wilks@arm.com>

	* match.pd: Add flag_unsafe_math_optimizations check
	before deciding on the widest type in a binary math operation.

	* gcc.dg/fold-binary-math-casts.c: New test.

From-SVN: r275632
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Richard Biener 2019-09-11 08:22:51 +00:00 committed by Richard Biener
parent 3d34b7afae
commit dc5b11916a
4 changed files with 17 additions and 68 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2019-09-11 Richard Biener <rguenther@suse.de>
Revert
2019-09-09 Barnaby Wilks <barnaby.wilks@arm.com>
* match.pd: Add flag_unsafe_math_optimizations check
before deciding on the widest type in a binary math operation.
2019-09-10 Richard Sandiford <richard.sandiford@arm.com>
* doc/tm.texi.in: Document that exactly one of CALL_USED_REGISTERS

12
gcc/match.pd
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@ -5056,18 +5056,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
&& newtype == type
&& types_match (newtype, type))
(op (convert:newtype @1) (convert:newtype @2))
(with
{
if (!flag_unsafe_math_optimizations)
{
if (TYPE_PRECISION (ty1) > TYPE_PRECISION (newtype))
(with { if (TYPE_PRECISION (ty1) > TYPE_PRECISION (newtype))
newtype = ty1;
if (TYPE_PRECISION (ty2) > TYPE_PRECISION (newtype))
newtype = ty2;
}
}
newtype = ty2; }
/* Sometimes this transformation is safe (cannot
change results through affecting double rounding
cases) and sometimes it is not. If NEWTYPE is

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2019-09-11 Richard Biener <rguenther@suse.de>
Revert
2019-09-09 Barnaby Wilks <barnaby.wilks@arm.com>
* gcc.dg/fold-binary-math-casts.c: New test.
2019-09-10 Marek Polacek <polacek@redhat.com>
PR c++/91673 - ICE with noexcept in alias-declaration.

58
gcc/testsuite/gcc.dg/fold-binary-math-casts.c
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@ -1,58 +0,0 @@
/* { dg-do compile } */
/* { dg-options "-Ofast -fdump-tree-optimized" } */
#include <math.h>
float
f (float x, float y)
{
double z = 1.0 / x;
return z * y;
}
float
g (float x, float y)
{
double a = 1.0 / x;
double b = 1.0 / y;
long double k = x*x*x*x*x*x;
return a + b - k;
}
float
h (float x)
{
double a = x * 2.0;
double b = a / 3.5f;
return a + b;
}
float
i (float y, float z)
{
return pow (y, 2.0) / (double) (y + z);
}
float
j (float x, float y)
{
double t = 4.0 * x;
double z = t + y;
return z;
}
float
k (float a)
{
return 1.0 / sqrtf (a);
}
float
l (float a)
{
return (double) a * (a / 2.0);
}
/* { dg-final { scan-tree-dump-not "\\(double\\)" "optimized" } } */
/* { dg-final { scan-tree-dump-not "\\(float\\)" "optimized" } } */