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Merged
thewilsonator merged 1 commit into from
Aug 17, 2019
Merged

ieeeFlags unittest: the optimizer might remove operations that the te… #7126

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14 changes: 13 additions & 1 deletion std/math.d
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Original file line number Diff line number Diff line change
Expand Up @@ -5690,15 +5690,17 @@ public:
static void func() {
int a = 10 * 10;
}

pragma(inline, false) static void blockopt(ref real x) {}
real a = 3.5;
// Set all the flags to zero
resetIeeeFlags();
assert(!ieeeFlags.divByZero);
blockopt(a); // avoid constant propagation by the optimizer
// Perform a division by zero.
a /= 0.0L;
assert(a == real.infinity);
assert(ieeeFlags.divByZero);
blockopt(a); // avoid constant propagation by the optimizer
// Create a NaN
a *= 0.0L;
assert(ieeeFlags.invalid);
Expand Down Expand Up @@ -5790,9 +5792,12 @@ void resetIeeeFlags() @trusted nothrow @nogc
{
version (InlineAsm_X86_Any)
{
pragma(inline, false) static void blockopt(ref real x) {}
resetIeeeFlags();
real a = 3.5;
blockopt(a); // avoid constant propagation by the optimizer
a /= 0.0L;
blockopt(a); // avoid constant propagation by the optimizer
assert(a == real.infinity);
assert(ieeeFlags.divByZero);

Expand All @@ -5812,12 +5817,15 @@ void resetIeeeFlags() @trusted nothrow @nogc
{
version (InlineAsm_X86_Any)
{
pragma(inline, false) static void blockopt(ref real x) {}
resetIeeeFlags();
real a = 3.5;
blockopt(a); // avoid constant propagation by the optimizer

a /= 0.0L;
assert(a == real.infinity);
assert(ieeeFlags.divByZero);
blockopt(a); // avoid constant propagation by the optimizer

a *= 0.0L;
assert(isNaN(a));
Expand Down Expand Up @@ -6351,10 +6359,12 @@ version (InlineAsm_X86_Any) @safe unittest // rounding
{
static T addRound(T)(uint rm)
{
pragma(inline, false) static void blockopt(ref T x) {}
pragma(inline, false);
FloatingPointControl fpctrl;
fpctrl.rounding = rm;
T x = 1;
blockopt(x); // avoid constant propagation by the optimizer
x += 0.1;
return x;
}
Expand All @@ -6370,10 +6380,12 @@ version (InlineAsm_X86_Any) @safe unittest // rounding
{
static T subRound(T)(uint rm)
{
pragma(inline, false) static void blockopt(ref T x) {}
pragma(inline, false);
FloatingPointControl fpctrl;
fpctrl.rounding = rm;
T x = -1;
blockopt(x); // avoid constant propagation by the optimizer
x -= 0.1;
return x;
}
Expand Down