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Fix real parameters of infinity and NaN.

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This commit is contained in:
Wilson Snyder 2023-01-28 22:11:09 -05:00
parent 7855a78a0f
commit a19dddf05e
3 changed files with 27 additions and 1 deletions
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@ -16,6 +16,7 @@ Verilator 5.007 devel
* Support unpacked unions.
* Support interface classes and class implements.
* Support global clocking and $global_clock.
* Fix real parameters of infinity and NaN.
Verilator 5.006 2022-01-22

6
src/V3EmitCFunc.cpp
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@ -541,6 +541,12 @@ void EmitCFunc::emitConstant(AstConst* nodep, AstVarRef* assigntop, const string
if (int(nodep->num().toDouble()) == nodep->num().toDouble()
&& nodep->num().toDouble() < 1000 && nodep->num().toDouble() > -1000) {
ofp()->printf("%3.1f", nodep->num().toDouble()); // Force decimal point
} else if (std::isinf(nodep->num().toDouble())) {
if (std::signbit(nodep->num().toDouble())) puts("-");
ofp()->puts("std::numeric_limits<double>::infinity()");
} else if (std::isnan(nodep->num().toDouble())) {
if (std::signbit(nodep->num().toDouble())) puts("-");
ofp()->puts("std::numeric_limits<double>::quiet_NaN()");
} else {
// Not %g as will not always put in decimal point, so not obvious to compiler
// is a real number

21
test_regress/t/t_math_real.v
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@ -6,7 +6,9 @@
// Version 2.0.
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
`define checkr(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d: got=%f exp=%f\n", `__FILE__,`__LINE__, (gotv), (expv)); $stop; end while(0);
`define stop $stop
`define checkr(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d: got=%f exp=%f\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
`define checks(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d: got='%s' exp='%s'\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
`define is_near_real(a,b) (( ((a)<(b)) ? (b)-(a) : (a)-(b)) < (((a)/(b))*0.0001))
module t (/*AUTOARG*/
@ -29,6 +31,7 @@ module t (/*AUTOARG*/
reg signed [95:0] cis96;
real r, r2;
integer cyc = 0;
string s;
realtime uninit;
initial if (uninit != 0.0) $stop;
@ -134,6 +137,22 @@ module t (/*AUTOARG*/
if (r != 74276402357122816493947453440.0) $stop;
r = real'(96'shf0000000_00000000_00000000);
if (r != -4951760157141521099596496896.0) $stop;
r = 1.23456;
s = $sformatf("%g", r);
`checks(s, "1.23456");
r = 1.0/0; // inf
s = $sformatf("%g", r);
`checks(s, "inf");
r = -1.0/0; // -inf
s = $sformatf("%g", r);
`checks(s, "-inf");
r = $sqrt(-1.0); // NaN
s = $sformatf("%g", r);
`checks(s, "-nan");
r = -$sqrt(-1.0); // NaN
s = $sformatf("%g", r);
`checks(s, "nan");
end
// Test loop