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Fix error on wide numbers that represent shifts, bug1088.

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This commit is contained in:
Wilson Snyder
2016-09-14 20:27:20 -04:00
parent 7d8c51181d
commit 2117fe414e
5 changed files with 54 additions and 4 deletions
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src/V3Premit.cpp
+5
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@@ -263,6 +263,11 @@ private:
// Shifts of > 32/64 bits in C++ will wrap-around and generate non-0s
if (!nodep->user2SetOnce()) {
UINFO(4," ShiftFix "<<nodep<<endl);
AstConst* shiftp = nodep->rhsp()->castConst();
if (shiftp && shiftp->num().mostSetBitP1() > 32) {
shiftp->v3error("Unsupported: Shifting of by over 32-bit number isn't supported."
<<" (This isn't a shift of 32 bits, but a shift of 2^32, or 4 billion!)\n");
}
if (nodep->widthMin()<=64 // Else we'll use large operators which work right
// C operator's width must be < maximum shift which is based on Verilog width
&& nodep->width() < (1LL<<nodep->rhsp()->widthMin())) {