tree 0df0b416e9880cab4d5cae9214a62a63c1b25cba
parent d790fce612dbdb79b547d355855b2a1c40e58b7e
author Than McIntosh <thanm@google.com> 1499717576 -0400
committer Than McIntosh <thanm@google.com> 1500048563 +0000

gollvm: fix issue with integer constant creation

The recipe used for constructing integer constant expressions in the
bridge was not properly handling the case where you have a signed
mpz_val with value ((int64_t) -1) being forced into an unsigned
integer Btype with fewer bits (ex: uint16 or uint32). This triggered
an assert, since the mpz_val was being converted to a uint64 value of
18446744073709551615, then the llvm::ConstantInt::isValueValidForType
check for the smaller type failed. Fixed code converts constant
value into an llvm::APInt with the correct signed-ness and number of
bits before invoking llvm::ConstantInt::get.

Change-Id: I68741eea6833705cffe2eb06e33c3e771072aaeb
Reviewed-on: https://go-review.googlesource.com/48111
Reviewed-by: Cherry Zhang <cherryyz@google.com>